Malicious PDF — malware analysis report

Static analysis result for SHA-256 951f8a71661cd509…

MALICIOUS

PDF

77.4 KB Created: 2021-06-01 05:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4ff02a2b22f3c5975f888473488e4c30 SHA-1: 35cc59c24b509cee85f36fad6c524289cce93c33 SHA-256: 951f8a71661cd50975d7a70cc11103694dd143830f08a9aa43595bb4435406da
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 0.9995

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://gimoguvi.ru/123?utm_term=descent+into+avernus+pdf+free+online PDF link annotation
    • https://tukajolikapuz.weebly.com/uploads/1/3/5/3/135346043/d6b1f3c29f2.pdfIn PDF document text
    • https://luradubesi.weebly.com/uploads/1/3/4/4/134486829/9d21b54521.pdfIn PDF document text
    • https://nagofojog.weebly.com/uploads/1/3/4/5/134586362/2988559.pdfIn PDF document text
    • https://tonuvufew.weebly.com/uploads/1/3/1/4/131438708/3900762.pdfIn PDF document text
    • https://botekajerojaj.weebly.com/uploads/1/3/4/7/134749353/jesewutake-jifagofajuw.pdfIn PDF document text
    • https://mokakabatedi.weebly.com/uploads/1/3/5/3/135300589/9703336.pdfIn PDF document text
    • https://sinepakeje.weebly.com/uploads/1/3/4/4/134490574/suxavil.pdfIn PDF document text
    • https://lotinusola.weebly.com/uploads/1/3/4/3/134321880/gopepakuwo-rototamowomezal.pdfIn PDF document text
    • https://xidusogosogi.weebly.com/uploads/1/3/4/3/134313600/julagipejuposiv_baxobesivus_zuwapa.pdfIn PDF document text
    • https://jitoxazenop.weebly.com/uploads/1/3/4/5/134588357/vaxenata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_6046b9d4aa850.pdfIn PDF document text
    • https://notemuwos.weebly.com/uploads/1/3/4/7/134717082/1387257.pdfIn PDF document text
    • https://niromegezos.weebly.com/uploads/1/3/2/6/132681660/zunuliwasox_rebipiguju_zajozi_vever.pdfIn PDF document text
    • https://xabesokexiba.weebly.com/uploads/1/3/4/3/134327988/badonisopok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383806/normal_606a9e81e2ea2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_6037989e15b24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447874/normal_5fe6ce841c5eb.pdfIn PDF document text
    • https://foxanebipukete.weebly.com/uploads/1/3/4/3/134309218/da6a0196.pdfIn PDF document text
    • https://teravotizu.weebly.com/uploads/1/3/4/3/134335056/gizakilunoxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://letonepamusi.pbworks.com/f/best_jump_scare_horror_movies_on_hulu.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/liriketinegajolurexoduta.pdfIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144442281/sigozidukewow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 5092 bytes
SHA-256: 1d1e7ae92b9b7cf12da9bf2fabf2079cd6dc6f42cff5dbeb165169188a6c6016
font_01_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 11552 bytes
SHA-256: 19fc8b7ff541a7531f70c32dd8ae3f01db58e0f7a5b6b67379b9d91f022de357
font_02_sfnt_off00011859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11859 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361