Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6c388c4e576acd…

MALICIOUS

PDF

70.6 KB Created: 2021-02-27 19:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8a5dfc83ab5df746344f30d4ef996289 SHA-1: 26b1da8e4c32d5166f7d49e3377350ed5a28c467 SHA-256: aa6c388c4e576acd098094ca5b2dcfd59b35c88287ca580e0f85af272246dead
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with 'baarspo.ru' being a primary indicator of a potential phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a deliberate attempt to create a network of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=how+to+fold+weider+ultimate+body+works PDF link annotation
    • http://tuwasukam.getenjoyment.net/73341731089.pdfIn PDF document text
    • https://puwevifu.weebly.com/uploads/1/3/4/4/134465284/musofubesusitas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_601bb4ed7d57c.pdfIn PDF document text
    • http://kufolalat.iblogger.org/77439444902.pdfIn PDF document text
    • https://dawoxojukuput.weebly.com/uploads/1/3/4/8/134890950/9d550c2bfe471.pdfIn PDF document text
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/pebelupipafepid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_601ab40d52314.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409405/normal_5fe2449531a33.pdfIn PDF document text
    • https://vademakab.weebly.com/uploads/1/3/1/3/131380849/3862545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456686/normal_600a53e83e14b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/52594738423.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_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 5412 bytes
SHA-256: d874d43245d45df17f3e7496e04438f24482c52879ab4f353f1cd519e1b5ee11
font_01_sfnt_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 10984 bytes
SHA-256: 8c38bdc2d2ad2baf729aa57b5ddf2c0b20d79a54b83be6400cdb139eb7b31279

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