Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09099a414ad8b36…

MALICIOUS

PDF

90.4 KB Created: 2021-03-03 16:07:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: bf1780ec6e7a4a6f02d5d3fafdf32a10 SHA-1: 870ec0c78585eb53fe920afe773e588ce23f6859 SHA-256: f09099a414ad8b36bbb7e6e171258dd68c828885f84ecda195fdbe4666416983
244 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains a large number of embedded URLs. Several heuristics indicate it functions as a link farm, with one URL pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a title related to the endocrine system, likely a lure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=cual+es+la+importancia+del+sistema+endocrino In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481673/normal_60238a0836d4b.pdfIn PDF document text
    • http://stankoff.org/fupobaxujetej7hr79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491437/normal_5fd6b1ca3ed32.pdfIn PDF document text
    • http://esmoney.site/ocl2_electron_dot_structurez3ba0.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/2ghEhe0/9579864623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505159/normal_6012c199eb2a0.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzaxube/dehbrgh/zivojosolozomomirekoguge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_602ee722903ac.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/4rqU2k9/boom_music_player_with_3d_surround_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473403/normal_6015ac7c9b478.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/eHkBUha/23217110428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480598/normal_603c0f95dc45a.pdfIn PDF document text
    • http://ig-about.net/magnum_condom_size_guideisv5b.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/vikawoxowevufo_mafiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408858/normal_6004bbe183fb9.pdfIn PDF document text
    • http://takipleskazan.org/nesajoziza4jm2s.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_off000121c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C1 5124 bytes
SHA-256: 1b616b8612627742f73b48c0d49928fef0851b6fe512f268cc1888162ea0f8c5
font_01_sfnt_off0001330e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330E 12188 bytes
SHA-256: 160dadcb7d6348cef12e8a70136850221abdc6f2a2e6e0bad0c721b7fcd4a0d2

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