Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d2fbd4469fb0b2…

MALICIOUS

PDF

72.4 KB Created: 2021-04-04 12:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e4ceeb42008d1ab58c8444f8a683e4ae SHA-1: 5ae0558c8cf145356bda3b4d2569bacfc4285bd8 SHA-256: 73d2fbd4469fb0b25ac786f2aab8007d524c6290e195fc865d91a0fc7d258bc4
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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=animal+crossing+city+folk+face+guide PDF link annotation
    • https://tubanepa.weebly.com/uploads/1/3/2/7/132740320/fojix_xuvusanupal.pdfIn PDF document text
    • http://uscreditcheck.info/zijegigetezekagu6gnfn.pdfIn PDF document text
    • https://sulunekuzesafap.weebly.com/uploads/1/3/1/4/131406846/famadowoweboji-bowobozodoxavi-nixifolabuwerot.pdfIn PDF document text
    • http://divuwon.iblogger.org/2178451530.pdfIn PDF document text
    • https://cdn.sqhk.co/gegemapapexa/jjihhhT/sudden_attack_2_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisezepemu/gpjanxy/how_to_make_bingo_cards_for_zoom.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/h39gdZ7/skin_editor_for_minecraft.pdfIn PDF document text
    • http://parhelifrl.space/que_es_metodologia_dela_investigacion_cientifica_wikipediadtkr7.pdfIn PDF document text
    • http://degitugeb.22web.org/homem_aranha_no_aranhaverso_hq.pdfIn PDF document text
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/gareko.pdfIn PDF document text
    • https://takigufumugo.weebly.com/uploads/1/3/5/3/135345847/54d8138137c597.pdfIn PDF document text
    • http://pristav.pro/99_polaris_scrambler_400_4x4_reviewsi9nnt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://podapuleleg.epizy.com/as_is_bill_of_sale_form.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_cb4fe1e1b6f7429587d282c81d018492.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e161dbc-db74-47a8-8ee9-89b20984ce67/sharp_tv_troubleshooting_red_light_blinking.pdfIn PDF document text
    • https://db532842-334f-4efb-8993-e67ec8f20ff5.filesusr.com/ugd/bc5be3_5d016a95398d4b5390a38e0fbdbe15d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72392e0f-b3a8-43cc-86e9-e5f4df36600f/2010_chrysler_town_and_country_transmission_fluid_type.pdfIn PDF document text
    • https://2e21b658-2967-4279-8f18-a03590b678a5.filesusr.com/ugd/f5e1b2_d7302138dcc14f07a3c0ec528b28e518.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52b4c3c7-323e-4ff7-9e48-9b9cfb48e283/avaya_one-x_communicator_suite_free_download.pdfIn PDF document text
    • http://fidotetunuxezi.epizy.com/88986698147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6304fc15-cd4b-4378-99f7-af3a2cf40435/48446232010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6221d04-f43f-4d40-8884-72971330f2bc/gofapexudevovagujerig.pdfIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_cdbf000f01d54887bc261e20da22ada2.pdf?index=trueIn PDF document text
    • http://vivotes.rf.gd/tabella_alcol_test.pdfIn PDF document text
    • https://b3df6b87-ca8d-4c26-b815-8c697753997b.filesusr.com/ugd/896a32_b6cd8a8bc7444c4aae4a8595dc7826ea.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 5496 bytes
SHA-256: b43513c4102ae0f9ba55135e3fda6e18248c026b1f19b48b05e753735287cebc
font_01_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 10488 bytes
SHA-256: 9cbeda24e4c3085c8e65099de33ebbaf59d4df893d620794922275c209132cfc