Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a59381da17bed7…

MALICIOUS

PDF

91.4 KB Created: 2021-04-11 04:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b8b8d3fa220a1196b1284fb3e1c5f4cc SHA-1: 836bb2572f87dc6c86e1def4ba4e7413735dbeec SHA-256: a0a59381da17bed7db2d5e81b8fc34a0864997d6d5747182e01edb1710658d06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9961

Heuristics 5

  • 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 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://lozipotod.ru/strik?utm_term=best+book+to+study+for+ap+biology PDF link annotation
    • http://davupopebuwiser.sportsontheweb.net/nie_boska_komedia_streszczenie_szczegowe.pdfIn PDF document text
    • https://cdn.sqhk.co/vusopukov/jaig4gj/brand_management_definition_in_advertising.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/DrjfjcZ/best_tower_defense_games_android_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kerosumumato/hj3dE5s/music_party_video_songs_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/popenewosaso/LhjGheh/fish_tycoon_2_virtual_aquarium_mod_apk.pdfIn PDF document text
    • http://zikevamakag.mygamesonline.org/auto_de_f_elias_canetti.pdfIn PDF document text
    • http://sibogufurab.medianewsonline.com/66906459845.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/contoh_amdal_pabrik_karet.pdfIn PDF document text
    • http://lexaliki.22web.org/nibegidukorizenufovidosuj.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/adobe_sketch_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_18a8ab25e2ee45d68a8eeeab6ae900aa.pdf?index=trueIn PDF document text
    • http://xivefasojag.epizy.com/titakejolubez.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/gasasasul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03dcfd0f-6c1d-4550-b345-296b5f2db43a/echo_cs_400_bar_and_chain_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71038969-bebb-4045-8fce-26b2dd3c5903/how_to_get_data_analysis_in_excel_365.pdfIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_90fa4061c96949f780f61f92da822b7b.pdf?index=trueIn PDF document text
    • http://sazurufupamaxa.myartsonline.com/wanugis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b106e0be-315f-4697-9a66-b61458a6dfb7/27703894345.pdfIn PDF document text
    • http://fupofew.epizy.com/38448743367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f61f2e-54c4-4015-9198-52a37ae22b83/functional_fitness_exercises.pdfIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_be05140caa404edeb3c99eb5e8fc2b6e.pdf?index=trueIn PDF document text
    • http://wugujub.onlinewebshop.net/98616352226.pdfIn PDF document text
    • http://tujanum.rf.gd/super_mario_bros_3_gba.pdfIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_2b85bcc4ce024fafbf1f16560c9c07f7.pdf?index=trueIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_90a9015993f740cbaabcb90a2380ee79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a236c67d-677a-4db9-a3f1-38a473d4768e/ruger_p95_jammed_during_reassembly.pdfIn PDF document text
    • http://limufij.myartsonline.com/50229562544.pdfIn 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_off000125ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CA 5564 bytes
SHA-256: 7045b52f2a41a53b893f91780db02854be67187ad6565b07d4e58a05ebf6d217
font_01_sfnt_off000138d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D0 11444 bytes
SHA-256: 61392afab2e56dd8567a5c8e99bbbaf4b48b3dd6e249871dbb4fc30614c5ad6d