Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28a98c51bbc910a…

MALICIOUS

PDF

70.8 KB Created: 2021-02-20 21:34:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 29065d76c64dadfffa76cd25b89edb5a SHA-1: 4ae021e45f18740f3c643a4a43b963583c7b0200 SHA-256: c28a98c51bbc910a01146b91ef67faa5cd7a99e9c92d5b0dff4c10728e77ab80
126 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 and employing UTM parameters, indicative of a link farm or phishing lure. ClamAV and ML classifiers flagged this as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=tipping+point+oan+youtube PDF link annotation
    • https://cdn.sqhk.co/verexoleki/Dgh5IyI/forest_background_hd_tumblr.pdfIn PDF document text
    • http://salebox.shop/hampstead_and_kilburn_uk_polling_reporttl1qh.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/idhahit/ribanufenitawomirubunir.pdfIn PDF document text
    • https://cdn.sqhk.co/xugosovemi/ihehCId/danakirifamenelewaret.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/18EOjiS/vivibux.pdfIn PDF document text
    • https://cdn.sqhk.co/nonagidux/cy3mBdP/lifeguard_beach_rescue_duty_emergency_rescue_team.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/228401783070fz4l.pdfIn PDF document text
    • http://supermagazforsale1.xyz/pandemic_war_roomzd045.pdfIn PDF document text
    • https://cdn.sqhk.co/tikisudolo/haTribA/32221287219.pdfIn PDF document text
    • http://opros.xyz/750063944292mqji.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwatak/gjhjjiD/53425542417.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/bJHwjbL/vefozokikemalamigijo.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/icgijiC/rasobixibeg.pdfIn PDF document text
    • http://hookup154.online/99059538870vphhp.pdfIn PDF document text
    • http://tricitysikhs.com/potepabefiibpf8.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/donarepemi/who_invented_maths_subject.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_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 4872 bytes
SHA-256: 0ffc3300db3367d5e0b4f333872fc6198b17094f622a1c2e5af481f21e9001c5
font_01_sfnt_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 11012 bytes
SHA-256: 7766980563450175c78d34d8fff3cd88db28ef87d13091426df91358a2cd534c

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