Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3fe83234a299e7…

MALICIOUS

PDF

70.1 KB Created: 2021-06-04 16:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c421a505d35e7b642d3303d3223e9e69 SHA-1: 72198cd65af76a43f40f43262a07f93c6e9f0532 SHA-256: 4b3fe83234a299e7db4ee8a13b1a7d792f8c6ea21bddad8c1421a7ea17ebcf1e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/123?utm_term=gridview+footer+template+not+showing+when+empty PDF link annotation
    • https://todonuratalojin.weebly.com/uploads/1/3/4/6/134605818/gafapezerogotugova.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486368/normal_5fe125b44aaed.pdfIn PDF document text
    • https://fazofiketir.weebly.com/uploads/1/3/4/5/134507238/budofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489717/normal_603200cba56ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490370/normal_5fc6667a01e2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_60655d2226646.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413004/normal_6032f02cb7d9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_603bb1bb57410.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/25ce953701e443c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482190/normal_5fc7e5c434121.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403673/normal_5fdd9d8216ffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445103/normal_603958148e9c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449616/normal_606c4049e86b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_603bc3f662df9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_601d93b36f158.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vazexetuv.pbworks.com/f/free_download_minutes_of_meeting_template_with_action_items.pdfIn PDF document text
    • http://matekid.pbworks.com/w/file/fetch/144604647/rorejorejopataxude.pdfIn PDF document text
    • http://pebegijopolo.pbworks.com/w/file/fetch/144536400/how_to_change_blade_on_milwaukee_skill_saw.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/essay_about_fall_season.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/mortgage_reference_letter_from_employer_template_uk.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/w/file/fetch/144544890/navajo_medicine_man_hearing_loss_remedy.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/glwiz_tv_app_free_download.pdfIn PDF document text
    • http://litorabi.pbworks.com/w/file/fetch/144524550/wozatosonojefezot.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144425112/quantifying_energy_flow_in_an_ecosystem_worksheet_answers.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_off0000d185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD185 5740 bytes
SHA-256: 61f2489c8c239127aac366591cf7ec3bb098371c4a8e78a78979c4ec899cb079
font_01_sfnt_off0000e4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 11112 bytes
SHA-256: 2ae6cccd107613ba8dbdcfa08266f530249c2f52cc85a9aaf0f374f857139f7b