Malicious PDF — malware analysis report

Static analysis result for SHA-256 badff5a0b6257c97…

MALICIOUS

PDF

78.5 KB Created: 2021-03-29 17:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c9e85612b44a738e3cec1fa8f5c27cde SHA-1: c09fa5126d9b26b913cfb24798721fff0e622f08 SHA-256: badff5a0b6257c97227a4ebe78578cc6bd94a23398ba04cc50c0e7f9dc534129
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=cat+eye+strada+wireless+manual PDF link annotation
    • http://vezerfa.xyz/96451843180vnxto.pdfIn PDF document text
    • http://ketadiets.site/the_crown_season_1_episode_9sw2ql.pdfIn PDF document text
    • http://supportcopyright.net/ultimate_ears_boom_2_waterproof_wireless_bluetooth_speaker_-_black_greytx4dd.pdfIn PDF document text
    • http://bio-ita.fun/pixugegomegirijojoxidetobukp86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377379/normal_6000699426ab3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454429/normal_60037bdd8f622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_60186e2750a50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/be678041-4087-44e8-bcf9-1b5147784401/troy_bilt_mustang_xp_50_review.pdfIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_c9dfe1a965f3404c9bc1fe518ec71f04.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4763bbb2-5f0a-49cf-8c96-ae9139700492/map_skills_quiz_4th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8edf75e0-d2f1-4dc6-a2dd-d084d7053f5a/33418717013.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_281cdb83b4714a03811f2f1c09b71d3c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a8cd98-b043-4edd-9dca-68ac662aa733/how_to_tell_if_motherboard_works_with_processor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74aaa357-9ebf-401b-862e-3a8f36bf2f6e/the_natural_life_mugs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d87b9b5-9019-44ff-b5c5-13a9e0c8ce0a/psalm_91_esv_bible_gateway.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c038d00-5b62-4d9a-889b-cb4a9700f717/37326458452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4bbe8cf-c740-4d0a-9fbb-2f8f6ecf3ca0/best_drum_beat_for_hip_hop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/950c0bd7-8e59-4b33-b269-872e9c8909db/yamaha_natural_sound_av_receiver_rx-v473.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_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 5068 bytes
SHA-256: 55519d9130e1e434eb51021c733c2361b9062550891ed2b8f66f43ef84f993c3
font_01_sfnt_off00010712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 11188 bytes
SHA-256: 7078471adf9f1332ad6c1789b8d9ad0113df4a62cf3f03b7507434d1869487c2