Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff45341b29f205e3…

MALICIOUS

PDF

76.0 KB Created: 2021-02-24 07:33:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 57d7a29506f894748433af2d18b3466b SHA-1: f7c5d2b96cc0ac56ea8e478d6d933abea72d872a SHA-256: ff45341b29f205e3566022cd077af4f500a932280c02b0db1eadeb4dec0d3669
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The document body is heavily obfuscated, but the presence of external links and the heuristic firings strongly indicate a phishing or malware distribution attempt.

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://bologen.ru/123?utm_term=is+taco+bell+chicken+power+bowl+healthy PDF link annotation
    • http://arevakar-travel.com/31550917356rb8kk.pdfIn PDF document text
    • http://poopo.ru/vubemizajoknfzjz.pdfIn PDF document text
    • http://wwnews.site/daviwumibuput36ktt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_5fd3770f49c9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419198/normal_5fefa3d476621.pdfIn PDF document text
    • http://cucoupon.info/sharp_carousel_microwave_good_guysorjx7.pdfIn PDF document text
    • http://twirlini.com/lorenzaccio_acte_3_scne_3_lecture_analytiquezc77o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416514/normal_6002e4b5b90fc.pdfIn PDF document text
    • http://voyazh-shina.com/lldb_gdb_cheat_sheet12ku8.pdfIn PDF document text
    • https://kobirozo.weebly.com/uploads/1/3/4/8/134846370/godadejulu_romepo_puvugafaxafezow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479210/normal_5fe0fa4e57dbf.pdfIn PDF document text
    • http://fishland.store/kiplinger_retirement_report_change_of_addressjm7j7.pdfIn PDF document text
    • http://trokot-shtorki.online/xefunabujiwakoqyqk6.pdfIn PDF document text
    • https://nubapatis.weebly.com/uploads/1/3/4/0/134095887/goxovijow.pdfIn PDF document text
    • http://manybigs.space/where_to_donate_used_toys_calgary0s475.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/lepefi/38717156221.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/nosogubawosekedawasukivom.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_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 5356 bytes
SHA-256: 30a7f5bce8711eb88483a2e1ae45d90bc16af815efdb7a587bdd6fd7a5b00530
font_01_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 11008 bytes
SHA-256: d238002c655f0f4035398aaf34a02c1b4e5306d5ff52293fab6453506a8420b1

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