Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f0ab80cb3b49c4…

MALICIOUS

PDF

89.1 KB Created: 2021-02-24 06:19:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 864f28bb40e830aa2696cb63b9ef9938 SHA-1: 8a10c0916de404760690ad1113385433d668edf1 SHA-256: f4f0ab80cb3b49c46e2db1ec85503626d0b86360a7456280995b63b9899f91a9
166 Risk Score

Malware Insights

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

The PDF contains embedded links and references to external URLs, including one that is algorithmically generated and hosted on disposable infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, appears to be a lure related to washing machine detergent, which redirects to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://maypoin.ru/strik?utm_term=where+to+put+detergent+in+bosch+washing+machine PDF link annotation
    • https://wunurobi.weebly.com/uploads/1/3/4/8/134881210/86b90.pdfIn PDF document text
    • https://seronenufides.weebly.com/uploads/1/3/1/4/131407086/438510.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450160/normal_60013976bf156.pdfIn PDF document text
    • https://wozomeki.weebly.com/uploads/1/3/0/7/130776066/886104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385633/normal_6023518151ffa.pdfIn PDF document text
    • http://zefunafujazi.22web.org/kedipamutalelutosujowaxi.pdfIn PDF document text
    • http://ketosimple.online/goxekinogogamawitosodefawuqhfr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460048/normal_60031bf5f21e0.pdfIn PDF document text
    • http://effektzhizni.ru/70587916703gosu7.pdfIn PDF document text
    • http://mybiol.site/44311921703lr4vy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450140/normal_5ffb08767008f.pdfIn PDF document text
    • http://creampiepow.club/legasista_trophy_guidels7gp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403940/normal_600d9b962e630.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408197/normal_60026bead44fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393752/normal_5fdc61515f755.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mevediruzorapaz.rf.gd/donug.pdfIn PDF document text
    • http://mirepili.epizy.com/64568066948.pdfIn PDF document text
    • http://napalujimawoz.rf.gd/gowebesevuvijaruwusa.pdfIn PDF document text
    • http://gudukamu.rf.gd/ntrca_applicant_copy_15.pdfIn PDF document text
    • http://lojuwuwa.rf.gd/bushcraft_attitude_magazine.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 5700 bytes
SHA-256: 78d8a50e564300f4786dd7579473e386f7863a912a5da1764e75b1367d177de2
font_01_sfnt_off00011c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2D 10760 bytes
SHA-256: e4118295d18ed93c2ad0249e06fef2070e618cef2a0f90c8d49af6e6ea2a3f10
font_02_sfnt_off000140f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F5 16148 bytes
SHA-256: 51babe3b44e703ca5a92278b053c112c5c116674d3b708c8e2cb3e4aa6bd9a04

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