Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72b9424453b6f6f…

MALICIOUS

PDF

82.2 KB Created: 2021-06-06 10:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ee3e65a0ddcc0086c87d0ca1d506d272 SHA-1: af41c3e1050486c70a48f863b38575c86f288e07 SHA-256: a72b9424453b6f6ffcd786b27511afb8a9624a8025216d2979f92c0ecae4656b
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://garglob.ru/pbw?utm_term=how+do+photocell+timers+work PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407318/normal_6051061a982f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485579/normal_6005b1266f3d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5fd9a498ecfb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_60475aa819d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_6018dad740b18.pdfIn PDF document text
    • https://jadamoxor.weebly.com/uploads/1/3/5/3/135344742/8083929.pdfIn PDF document text
    • https://geripipo.weebly.com/uploads/1/3/4/3/134371036/9782240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403415/normal_606148ba8604d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459470/normal_5fdae1fb6743a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387242/normal_5ff57f5a9371c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_603d230c80362.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ronefete.pbworks.com/w/file/fetch/144491241/manual_capsule_filling_machine_south_africa.pdfIn PDF document text
    • http://kekirow.pbworks.com/f/kakebunowadulome.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144601083/93889434263.pdfIn PDF document text
    • http://lulatigono.pbworks.com/f/23935043206.pdfIn PDF document text
    • http://varulemenel.pbworks.com/f/60489440319.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/w/file/fetch/144631155/vimugenisuzedadipunij.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144557424/simple_spoken_english_sentences.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/xoruxoxadekanujilugofoju.pdfIn PDF document text
    • http://xugilip.pbworks.com/w/file/fetch/144559380/tegezululo.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/w/file/fetch/144545928/gituwazerapitelufawo.pdfIn PDF document text
    • http://gorixose.pbworks.com/w/file/fetch/144616689/83089868437.pdfIn PDF document text
    • http://tarogifere.pbworks.com/f/jabra_75t_one_side_not_working.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/f/94170386088.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/f/9733293450.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_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 5220 bytes
SHA-256: 209b1016d93a4a5ef05703d796dcc8d4b1a22fb4325245b9e372d290ab3ac01d
font_01_sfnt_off0001135b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135B 11728 bytes
SHA-256: 4f7a2224c0ddd2a9b127596b6dff64be33fbec89fa459ea62bd3878744bcd89f