Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b79e483df118da4…

MALICIOUS

PDF

137.7 KB Created: 2021-03-25 06:03:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c63cc1a4fa92e3fcfa9eb5247418630e SHA-1: 9d0f4c173fecf2f0944277545b00d359f5af2eb3 SHA-256: 2b79e483df118da49e364f146ef2409cbb7ef0fc83f045887c43fbe93ad9795d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/award?keyword=adobe+pdf+signature+password+reset PDF link annotation
    • http://tixesikixux.mygamesonline.org/final_fantasy_xv_total_gameplay_time.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/suvuj.pdfIn PDF document text
    • http://xejepurefe.scienceontheweb.net/rimekulaxiwi.pdfIn PDF document text
    • http://rowewuxeg.getenjoyment.net/minolta_srt_101_vs_102.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/oriflame_catalog_january_2020.pdfIn PDF document text
    • http://wivikaxebox.medianewsonline.com/biografia_augusto_cury.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/british_english_grammar_by_ak_singh.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_71c3079ab2c645979c3fb79b532447d1.pdf?index=trueIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_dc5a1f2ca14e46bfa15e40a5a0c3bfd7.pdf?index=trueIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_2ba6efd92b784c76912d0176649c62f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d7b7af-8d5e-497e-b52c-d297ee01ca6c/72372287981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b635e244-3d01-48b2-8bf4-8d9380328d2a/pipe_fitter_tools_name_list.pdfIn PDF document text
    • https://b760d8db-9746-4821-aa2b-94c9f806d328.filesusr.com/ugd/26ce45_1fb1204a972f4d3dbb6435f6af770db7.pdf?index=trueIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_a26da1beda6b42f8aa36c0dc96a76527.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_44a5476d33eb480e86b02b13798676c5.pdf?index=trueIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_d1a690d4708040718c42d40212a59d73.pdf?index=trueIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_11b73315db1248fda07c07a5350d7b12.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a5ee48-bb6f-4e3d-a5e1-0537c298c52e/palabras_agudas_llanas_y_esdrujulas_4_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/816dde1e-89bd-4b0b-bb04-a1fcc6f23d68/temas_presentes_en_la_casa_de_bernarda_alba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f028f7b6-698e-4d76-91fc-17bfc35b4f12/nawozufojabobuxexakobaxid.pdfIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_d179fc2732024874b5dd0936019c5024.pdf?index=trueIn PDF document text
    • http://lamupimifuban.onlinewebshop.net/what_is_the_synonym_of_orientation.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_084a1e987b124402a1cf061fb5c23ed7.pdf?index=trueIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_a6e4c2b9f65d4c4ba34a9391e7e3f518.pdf?index=trueIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_33e58fde989947e9840d46f4d6a8a493.pdf?index=trueIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_1a4d6d5ff8c64ec2bea9cd23d59145ea.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001d500.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1D500 23460 bytes
SHA-256: aae5dca9c23784d48cb7676ef4d171efd941da43895dc32949f16fdeb353a090
font_00_sfnt_off00019011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19011 5396 bytes
SHA-256: 5824ff10ee4d32538668dae3fc6626dae7c84087c84e04c9cc002cc7f7ef5346
font_01_sfnt_off0001a287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A287 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0001adea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADEA 11428 bytes
SHA-256: 6aafd434a85cb1b343ba7a02d4ab02ca07e92e396f47bfc37bc440585c098308