Malicious PDF — malware analysis report

Static analysis result for SHA-256 553ed168d13e6de8…

MALICIOUS

PDF

85.7 KB Created: 2021-04-25 04:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 664af55a6181da12d3b13fb9d009fcb8 SHA-1: 7743ae1a605b15ae73d4887a3082254fb63fcb1a SHA-256: 553ed168d13e6de8c68cedd6c2b343d76753494c210af21dc82c5f43b5e0131b
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam tactic. The document body, though partially corrupted, indicates a lure related to GMAT preparation. The presence of embedded JavaScript, though not directly analyzed for malicious intent in this report, combined with the extensive link farm, strongly suggests this PDF is designed to redirect users to malicious or scam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=how+to+prepare+for+the+gmat+in+2+months PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373004/normal_6021aab2109cb.pdfIn PDF document text
    • https://gogalafubixuvu.weebly.com/uploads/1/3/4/6/134642314/wutajesunufukerug.pdfIn PDF document text
    • https://rapinawenag.weebly.com/uploads/1/3/0/9/130969945/e1fe4f33a3.pdfIn PDF document text
    • https://kujedoduzenawo.weebly.com/uploads/1/3/0/7/130776750/2958098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_60163a4f8a5db.pdfIn PDF document text
    • https://zosafetudosejo.weebly.com/uploads/1/3/4/6/134670517/2879438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416319/normal_60673d43b042e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463559/normal_5ff2192cdb136.pdfIn PDF document text
    • https://powilumoratome.weebly.com/uploads/1/3/4/3/134368047/xubozexow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447497/normal_5febda4752bae.pdfIn PDF document text
    • https://lakafoxure.weebly.com/uploads/1/3/4/2/134266374/8a58ce05f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_600f18abb696d.pdfIn PDF document text
    • https://jejaparax.weebly.com/uploads/1/3/5/3/135332208/zebaxukaxazu_zodubovuv_poxadede.pdfIn PDF document text
    • https://kijomexed.weebly.com/uploads/1/3/1/0/131069838/lokavuxibit.pdfIn PDF document text
    • https://najovukuno.weebly.com/uploads/1/3/1/4/131453374/9044321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384310/normal_60466640dc3a6.pdfIn PDF document text
    • https://tewosafaxuw.weebly.com/uploads/1/3/1/3/131379700/a0628d14f0d2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477635/normal_5fccbfee99b1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://debalipusafuj.epizy.com/rijijinagewonukaniwoz.pdfIn PDF document text
    • http://rezemuxosezew.epizy.com/fejugido.pdfIn PDF document text
    • http://rirafobom.rf.gd/english_grammar_tense_rules_in_hindi.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_off00010f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F87 5468 bytes
SHA-256: 3d24b073c0e90189ffb494e6dde928db8774e7f4e4dec8bc8210895af0332094
font_01_sfnt_off00012211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 11608 bytes
SHA-256: e3cc72caf420ff7a42aa6fc8ae336addef23552ea2e6aa16366a72295d946e1d