Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9683aee27b2a5d…

MALICIOUS

PDF

76.4 KB Created: 2021-04-20 08:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6c28c260964da0742735465d4e56352c SHA-1: b5bbcc1e95dd8b5a737e14aaaf40c726e11245f0 SHA-256: aa9683aee27b2a5d64c8258f3d62343cd74a2c50e48abfc956e4f210526adf23
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text fragments that, combined with the heuristics, point towards a lure for users to visit external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=silent+hunter+3+torpedo+guide PDF link annotation
    • http://biomanua.website/422214294298uv2k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420592/normal_6012085662d39.pdfIn PDF document text
    • http://strita.space/how_to_pair_jabra_talk_45pqybs.pdfIn PDF document text
    • http://ragadugizidej.22web.org/33111823360.pdfIn PDF document text
    • https://remoruputudedux.weebly.com/uploads/1/3/4/0/134017090/2ce7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_6035d9b149889.pdfIn PDF document text
    • https://ketesepirexutub.weebly.com/uploads/1/3/5/3/135306065/ferokora.pdfIn PDF document text
    • http://reactivascotia2020.com/devi_bhagavatampizab.pdfIn PDF document text
    • http://kopolebukerone.iblogger.org/pofuwodotije.pdfIn PDF document text
    • https://wolofineso.weebly.com/uploads/1/3/4/5/134598063/9677784.pdfIn PDF document text
    • http://pisazujinatef.iblogger.org/sozafivefigamamukum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_6058646764208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_6037a8bb1db97.pdfIn PDF document text
    • http://robudodupuwa.iblogger.org/dinuzifefajaxaxepogodus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d23bdc9-1156-43ec-a804-8b410426dc7a/49728690382.pdfIn PDF document text
    • http://difedomuki.epizy.com/7029818327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fdb7456-9d19-477a-9eff-188ae2c19347/jufek.pdfIn PDF document text
    • http://vunatavinede.epizy.com/67420924993.pdfIn PDF document text
    • http://lelekon.epizy.com/55120585643.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_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 5100 bytes
SHA-256: 915587e4c22f57aac90d3ac943ee60c20511bf8ba86332b5c0e2a32f176314ce
font_01_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 10848 bytes
SHA-256: a7bc276096fb701aa52c4ee1a47a4a866562eedbbab720e2b1f88fe5451ac705

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