Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ed6994899752c3…

MALICIOUS

PDF

80.7 KB Created: 2021-06-07 02:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9159769f256bd3f3b83bf4ad4a40eacb SHA-1: 20604300db69597fe29a4d8c0575abb2d1c63316 SHA-256: f2ed6994899752c33b79f271b454a761b373c26ab8d67cf450bc7b2e767559c0
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, indicative of a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious or deceptive content, likely as part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://archism.ru/pbw?utm_term=propriedades+coligativas+quest%25C3%25B5es+vestibulares PDF link annotation
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/6927227.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372960/normal_5fcf982bd84ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455370/normal_5ffdcede53023.pdfIn PDF document text
    • https://lelebozo.weebly.com/uploads/1/3/4/5/134578107/4534736.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/915c70250041d4.pdfIn PDF document text
    • https://napumijuvof.weebly.com/uploads/1/3/4/7/134758185/dowalizulasinag.pdfIn PDF document text
    • https://kenuvibugitevam.weebly.com/uploads/1/3/4/7/134700053/7002704.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/2722120.pdfIn PDF document text
    • https://dujajiworexu.weebly.com/uploads/1/3/4/8/134848881/9887621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_5fd7bfd01146e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492281/normal_5fdafe3212c49.pdfIn PDF document text
    • https://parukiwodisurup.weebly.com/uploads/1/3/4/4/134455528/1764226.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/7285686.pdfIn PDF document text
    • https://bajevopado.weebly.com/uploads/1/3/4/4/134456845/6e952b892603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446045/normal_6032ac6a808a0.pdfIn PDF document text
    • https://padilokemim.weebly.com/uploads/1/3/1/3/131381900/9387451.pdfIn PDF document text
    • https://nikovazof.weebly.com/uploads/1/3/2/6/132682709/f91e0.pdfIn PDF document text
    • https://kojoridenifuzav.weebly.com/uploads/1/3/1/4/131406931/nimene-tufopo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxulolo.pbworks.com/f/irregular_verbs_quiz.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/w/file/fetch/144716316/what_do_you_mean_by_information_technology_act_2000.pdfIn PDF document text
    • http://wemilamozede.pbworks.com/f/14360169112.pdfIn PDF document text
    • http://zalemofe.pbworks.com/f/wuxugubivi.pdfIn PDF document text
    • http://saxonax.pbworks.com/w/file/fetch/144755781/how_to_restart_a_samsung_a2_core.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/glwiz_tv_app_free_download.pdfIn PDF document text
    • http://bokibagaror.pbworks.com/w/file/fetch/144666480/how_to_use_i_flash_device_hd.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/f/tufuwoposela.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_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 5788 bytes
SHA-256: 688dc29d9b9280fe4fcb2dbe033be51cab45f24dbbff1137df70755f6b67486b
font_01_sfnt_off00010a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 13476 bytes
SHA-256: ef15f161cdde0ff049f83fbc6ea0f34b75e3637a2748027018afc6c8479053ce