Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec05e1d0499da75…

MALICIOUS

PDF

77.6 KB Created: 2021-03-11 07:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 3d4b5353f6765426caa42e2108144ad3 SHA-1: 67e950c58d11a80f9ba00f42c514a3643fffdbc1 SHA-256: bec05e1d0499da75c029725c3d328dbface7bf756fcedd1664ebda295934084d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The presence of a URL with a 'utm_term' parameter suggests an attempt to track user engagement with specific search terms, likely for SEO manipulation or phishing. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=cateye+strada+double+wireless+battery+replacement PDF link annotation
    • https://cdn.sqhk.co/notenirikev/Mwbjgi9/sadafatu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464052/normal_5ff7a442549eb.pdfIn PDF document text
    • http://joritirumag.mypressonline.com/govoziwodojegimu.pdfIn PDF document text
    • https://cdn.sqhk.co/jipodipotaj/8Fejhhg/squeeze_theorem_worksheet_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/jjnghhe/pixel_force_2_mod_apk_1._4._1.pdfIn PDF document text
    • https://jiwuzutobaduf.weebly.com/uploads/1/3/4/8/134889186/mimupixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421943/normal_603ffe887b43a.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/ZAEhegc/2006_weekend_warrior_toy_hauler_floor_plans.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484639/normal_6023d5a850957.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/eiirOgc/afro_taper_fade_black_male.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448103/normal_602e7d413d5e3.pdfIn PDF document text
    • https://wudowesowuzoka.weebly.com/uploads/1/3/4/5/134584143/povidetosu-fusudetoz-giganoxuluv-sixojevajo.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/kudavujokega.pdfIn PDF document text
    • https://rakuwogu.weebly.com/uploads/1/3/4/8/134858672/7414996.pdfIn PDF document text
    • http://vivudanu.scienceontheweb.net/gifulamun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411270/normal_5fdc6b1da94f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_600a5a52d71d0.pdfIn PDF document text
    • https://cdn.sqhk.co/nenakowi/wIDyFgj/sivami.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370053/normal_5fe196a115557.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/jKigheO/51954250037.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/iiG2ggX/7941275350.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388428/normal_5fe44aa0c570b.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_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 5460 bytes
SHA-256: 98ef24b204b5ef7e943904e04da29fe0b5ecd0c1230c5e6f315cf6d32f4a916e
font_01_sfnt_off00010477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 10588 bytes
SHA-256: a286e117b51bc08597419057403363d5e6826d572e8f8ecb73dc0a5a71db83da