Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fb6f16458d390f…

MALICIOUS

PDF

76.6 KB Created: 2021-01-24 10:32:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ff0b3789eea2b8df3ddde33e56edcbb4 SHA-1: 220f3846191633630124720a35a73cb171f20557 SHA-256: e4fb6f16458d390f82c0114a921e5779e11667e1db0f56b09c4f09335070406f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful content, possibly for SEO manipulation or to deliver further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=omron+10+series+wireless+upper+arm+blood+pressure+monitor+bp786n PDF link annotation
    • https://zilisekisami.weebly.com/uploads/1/3/1/4/131437354/80dc117213.pdfIn PDF document text
    • https://dazuzoboda.weebly.com/uploads/1/3/4/0/134017564/0cae489a1657.pdfIn PDF document text
    • https://nejotadig.weebly.com/uploads/1/3/1/1/131164569/fitutonatamed.pdfIn PDF document text
    • https://jewupoma.weebly.com/uploads/1/3/1/4/131437657/wixunagokisu.pdfIn PDF document text
    • https://site-1174929.mozfiles.com/files/1174929/vesunidavifevubase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383792/normal_5ff9d96592659.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411917/normal_5fdcad3c1c1bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415309/normal_6000c5161e9e8.pdfIn PDF document text
    • https://site-1178803.mozfiles.com/files/1178803/lazazurotovesiguzozelim.pdfIn PDF document text
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/2262611.pdfIn PDF document text
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/vebasiv.pdfIn PDF document text
    • https://katozela.weebly.com/uploads/1/3/0/8/130874493/ea9e06a8d60532.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482418/normal_5ffdf771cb85d.pdfIn PDF document text
    • https://site-1207189.mozfiles.com/files/1207189/50235114819.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/Yijh6ij/the_last_crusade_book_burning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386086/normal_6003c4834598d.pdfIn PDF document text
    • http://xakugitanaz.iblogger.org/direction_worksheet_for_preschool.pdfIn PDF document text
    • https://site-1176114.mozfiles.com/files/1176114/tevapi.pdfIn PDF document text
    • https://ruzepekipup.weebly.com/uploads/1/3/1/3/131398244/zefujijubizag-povup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funurebebepoti.epizy.com/summer_acrostic_poem_template.pdfIn PDF document text
    • http://ritarejameja.epizy.com/dubimisixawibamosiz.pdfIn PDF document text
    • http://posugez.epizy.com/ambala_songs_masstamilan.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_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 5988 bytes
SHA-256: 62db5f202f101d36af806e34df37cae571d9a44619f6c3484a0d90b3805c5ace
font_01_sfnt_off00010050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10050 10572 bytes
SHA-256: 676ebc12407b2550c8f5f5766f84797b087a57dcd329d2ce3f8be853c20e4683