Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29a6a0a2baba91a…

MALICIOUS

PDF

80.2 KB Created: 2021-06-11 10:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 72129ffeabd0385404a68d49bbccebd3 SHA-1: 913702014428986d8ee79dc827a790ae870a654b SHA-256: c29a6a0a2baba91a1a4048e45042864c4db7065377a283180fde071e1da57f0e
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 0.9992

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://chcial.ru/pbw?utm_term=san+andreas+free+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460975/normal_6033456782905.pdfIn PDF document text
    • https://vimawagugagepa.weebly.com/uploads/1/3/4/7/134732412/misabotabasob_xodop.pdfIn PDF document text
    • https://bepizapumi.weebly.com/uploads/1/3/5/3/135349865/1699014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427076/normal_6027758d16f2e.pdfIn PDF document text
    • https://gonaxazurunuta.weebly.com/uploads/1/3/0/7/130739517/8210234.pdfIn PDF document text
    • https://kiburosipaso.weebly.com/uploads/1/3/4/6/134601321/kimenezawuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459323/normal_6016bff9f3024.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4411483/normal_60aff8f01f199.pdfIn PDF document text
    • https://falomomorojed.weebly.com/uploads/1/3/1/4/131438216/3687479.pdfIn PDF document text
    • https://fipakitifenilab.weebly.com/uploads/1/3/4/0/134042330/6240056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_604567db9daa8.pdfIn PDF document text
    • https://geripipo.weebly.com/uploads/1/3/4/3/134371036/tiberonalupefufef.pdfIn PDF document text
    • https://xekanowodupap.weebly.com/uploads/1/3/0/7/130739303/sotarolifemulowo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kokoxudalux.pbworks.com/w/file/fetch/145114329/download_and_save_instagram_videos.pdfIn PDF document text
    • http://supulilofib.pbworks.com/w/file/fetch/144936294/aesthetic_mods_for_minecraft_pe.pdfIn PDF document text
    • http://tusawijer.pbworks.com/f/3205427221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d70123c-e89d-4524-8a81-a63a8c3fa35f/julius_caesar_act_3_scene_3_summary_sparknotes.pdfIn PDF document text
    • http://medodadepud.pbworks.com/w/file/fetch/144646527/vishnu_sahasranamam_gujarati_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13ab5c32-fdde-4e21-853b-b66629e52aa1/toro_s-620_snowblower_manual.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/83725468149.pdfIn PDF document text
    • http://tozuxexap.pbworks.com/f/20470156835.pdfIn PDF document text
    • http://xadobodit.pbworks.com/w/file/fetch/144896667/74872867679.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/w/file/fetch/144735561/super_mario_bros_3_classic_rom_hack_online.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_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 5292 bytes
SHA-256: 51c314fb0907b07f63043e623f7d4d6edd8f7bc41683c6ddf0d554ee2d32d6e8
font_01_sfnt_off00010c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 10900 bytes
SHA-256: c7ea45f749b0dbd51642ea1eef26bb97cf26fc9dada4faadde5be81e9940e5c1