Malicious PDF — malware analysis report

Static analysis result for SHA-256 095f7bf33e9c5910…

MALICIOUS

PDF

71.9 KB Created: 2021-02-22 09:16:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 38a6c914ef9604acdae290efef2b8431 SHA-1: 96abad21848350319964b689cd775a70a89f7487 SHA-256: 095f7bf33e9c5910af88a655f0de94dc21043e5f2c7c7f273b6ef0f1b2ef4c42
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains and Weebly-hosted files, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to serve further malicious content. No scripts were extracted, but the PDF structure itself is the primary vector.

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://jacksth.ru/123?utm_term=indoor+motocross+tracks+near+me PDF link annotation
    • https://riderasal.weebly.com/uploads/1/3/0/7/130738784/3945342.pdfIn PDF document text
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/rumumufijuxab.pdfIn PDF document text
    • https://cdn.sqhk.co/bimonabozo/jhgdghh/the_perfect_roommate_imdb.pdfIn PDF document text
    • http://trenketo.buzz/23854238072z89vv.pdfIn PDF document text
    • http://legendnat.space/22202429388a09yc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368951/normal_5fdd8bfaa25fd.pdfIn PDF document text
    • https://tisawisapapaw.weebly.com/uploads/1/3/5/3/135326074/c5852cd08.pdfIn PDF document text
    • https://wuzitefagoxu.weebly.com/uploads/1/3/1/8/131856046/592be.pdfIn PDF document text
    • https://dewosuto.weebly.com/uploads/1/3/1/4/131453399/nowolebubisarabazumu.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/6387123.pdfIn PDF document text
    • http://realwockyc.info/why_is_my_fire_tv_stick_remote_not_workingdbo9r.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/jbieZif/viridian_city_gym_map.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/gjih4hd/final_fantasy_14_gold_saucer_fashion_report.pdfIn PDF document text
    • http://sandiego-podcasts.com/wipodestx7b.pdfIn PDF document text
    • https://mamifamutimas.weebly.com/uploads/1/3/1/8/131871874/a6f92003c.pdfIn PDF document text
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/wojugelijixapafumemo.pdfIn PDF document text
    • https://fuwofinirofen.weebly.com/uploads/1/3/1/6/131637723/gujemobebipuz.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/jifhKhj/bhop_godlike_5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 5052 bytes
SHA-256: c08e15a84035e00a7315dc7503d659ba38a741e868cec19cc1f71836db60d1e2
font_01_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 10952 bytes
SHA-256: 790ffc206090a8d60baea4bcf480e5c0e55540c8dd65af28a8bca31d7a541487

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