Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3804f918e932da…

MALICIOUS

PDF

76.5 KB Created: 2021-03-16 17:01:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7f01bb2ba157f362ef5a3ea5e973ae4d SHA-1: d2e4b17c46fad970cf55418b21fd3547383ca3c7 SHA-256: ea3804f918e932da138815c43e6162c9af475ad2606dc8e33ea5a017aff6df30
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. While no scripts were explicitly extracted, the PDF structure and URI firings point towards a malicious document designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/award?keyword=swot+analysis+for+students+in+college+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393898/normal_6023faa259ccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403818/normal_604d9dccc2347.pdfIn PDF document text
    • https://guxipalun.weebly.com/uploads/1/3/1/8/131857363/nabegevonibixun_fatidufunew.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/dhd1xib/52391092332.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/jbm9uR8/vumujinegadi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491437/normal_5ffd7e197f9c5.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/bunopasosuwowonoxev.pdfIn PDF document text
    • https://cdn.sqhk.co/wezupobuwab/1geljco/stone_age_boy_book_youtube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_601c5b5b34c24.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/jobuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480148/normal_60187df7e05dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444104/normal_602b3b17b8601.pdfIn PDF document text
    • https://cdn.sqhk.co/lexuxeza/bnBujgj/kiwar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466146/normal_601c7d9a247a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/los_cinco_lenguajes_del_amor_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/denon_avr_791_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/708c5f36-669f-4a5c-a357-a0c4a055f5cd/which_dvd_players_are_region_free.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/89353051261.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/85009757702.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/speaker_booster_pc_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0bcb115-c1b0-4cf3-8fd6-d984adb530c6/starbucks_staff_handbook.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_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 5620 bytes
SHA-256: d8f78c76dfdd438a992ff5053b29e27e80b82492993e9b32544f904cc5c2da61
font_01_sfnt_off0000ff9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9C 10752 bytes
SHA-256: a8964b62bbef30ea378c7864338ee85881ce7ee5a2b93098d0ef7b37de0c7722