Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ae6312e15d0b15…

MALICIOUS

PDF

74.5 KB Created: 2021-02-18 20:02:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fc04ab467cd0dc307f05b67371fd10af SHA-1: 0f385a502c04819b797704a662f1e3f8bca6c12d SHA-256: 98ae6312e15d0b15a497b8c99de85b867cdc96596bfc47d23bc416c7e4ceffd7
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a site discussing how to obtain a 'war horse' in RDR2, suggesting a lure for in-game item scams or phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, further supporting a malicious intent. ClamAV and ML classifiers also flagged this PDF as malicious.

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://baarspo.ru/wb?keyword=rdr2%20how%20to%20get%20war%20horse%20without%20pre%20order PDF link annotation
    • https://madajeguruxe.weebly.com/uploads/1/3/4/3/134348767/fusukibarezu.pdfIn PDF document text
    • https://famixarusefon.weebly.com/uploads/1/3/4/3/134396739/fipuva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475741/normal_5feb7f83abcc1.pdfIn PDF document text
    • http://vefatata.22web.org/28911209488.pdfIn PDF document text
    • http://milesnires.xyz/best_electrical_engineering_booksuihcb.pdfIn PDF document text
    • http://ovca.space/acg_guidelines_variceal_bleeding5vfrj.pdfIn PDF document text
    • http://bristol-yalta.run/sigukulu6pojf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379369/normal_5feced1ebb55c.pdfIn PDF document text
    • http://webpost.pro/beechcraft_b60_duke_performance_specs4rzkq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://femasusatatovet.epizy.com/daziritof.pdfIn PDF document text
    • http://kidejuwukaj.epizy.com/ledifigoxovuvegusa.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/imine_reduction_formic_acid.pdfIn PDF document text
    • http://favekagopu.epizy.com/momapujosa.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/inverse_functions_identifying_pairs_worksheet_answers.pdfIn PDF document text
    • http://zenejifawulo.epizy.com/xenikepojomu.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_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 5420 bytes
SHA-256: 1a8704edc62e07901da8217dbc1414f9ae3f69aae983fec16ea19cf99890b275
font_01_sfnt_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 10404 bytes
SHA-256: d51b12a531144f078919ce94e443faa2a6f7e8c7ca3894b993455781606f73b4

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