Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bbf412f52ba013…

MALICIOUS

PDF

68.8 KB Created: 2021-06-04 12:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7c0b8669fa5988b9213e2685be8e7eaa SHA-1: ed62313028e59cafdcf4ea53dc4820feddd2d6b7 SHA-256: 63bbf412f52ba013815a8c19fdbb6030f780e80abda6aebe0d503ed5e61e3e76
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=phpexcel+getactivesheet+by+name PDF link annotation
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/bopomo.pdfIn PDF document text
    • https://pamoxoxose.weebly.com/uploads/1/3/4/6/134656592/kodafunaxigivopudase.pdfIn PDF document text
    • https://jaxuwigoba.weebly.com/uploads/1/3/4/2/134266140/2045170.pdfIn PDF document text
    • https://pivuwexigika.weebly.com/uploads/1/3/4/3/134320842/955ed6.pdfIn PDF document text
    • https://vaxokivov.weebly.com/uploads/1/3/1/4/131453734/matominin-zexud-nukoju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380876/normal_5fef35be31cf4.pdfIn PDF document text
    • https://japutiluzot.weebly.com/uploads/1/3/5/9/135991977/nexumerilo-nuwexalej.pdfIn PDF document text
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/41507b19f2be251.pdfIn PDF document text
    • https://bitokulizawefe.weebly.com/uploads/1/3/4/6/134684274/pabanol-nopusixomebar-folago.pdfIn PDF document text
    • https://panirosarukiza.weebly.com/uploads/1/3/4/1/134132539/9228419.pdfIn PDF document text
    • https://kipunazumalimak.weebly.com/uploads/1/3/4/7/134755782/9068603.pdfIn PDF document text
    • https://fitikelamo.weebly.com/uploads/1/3/4/6/134668278/futugazilaxakexuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393763/normal_5ffea9f38dcc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468812/normal_60073c62135ef.pdfIn PDF document text
    • https://zavadogo.weebly.com/uploads/1/3/4/3/134325895/wuruxaduvufil.pdfIn PDF document text
    • http://www.codepleIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pagorevet.pbworks.com/w/file/fetch/144447411/94880439812.pdfIn PDF document text
    • http://fuvuxagola.pbworks.com/w/file/fetch/144601551/how_to_revert_ipad_to_previous_backup.pdfIn PDF document text
    • http://bijinim.pbworks.com/w/file/fetch/144594297/homophones_by_bye_buy_worksheet.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/81895705522.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/f/tinaxadizinowemajogug.pdfIn PDF document text
    • http://xigivesupi.pbworks.com/w/file/fetch/144591123/japanebokeris.pdfIn PDF document text
    • http://fevawigo.pbworks.com/w/file/fetch/144419265/gta_5_download_for_android_apk_and_obb_without_verification.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/f/vapako.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144416094/monisaw.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_off0000ce89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE89 5624 bytes
SHA-256: e01561b23628a7881912e6d81ff2146a37f4bdb06922bdf3eff163367a24528f
font_01_sfnt_off0000e198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 10724 bytes
SHA-256: 816281a3b334c966c8b0fbbd950ddd0c770d505487839106e95eaf62504e78bb