Malicious PDF — malware analysis report

Static analysis result for SHA-256 b011ca453cfd8962…

MALICIOUS

PDF

68.8 KB Created: 2021-02-18 19:17:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5265304fc40223e85c6ce552953b5f4a SHA-1: 478d6d7da8dcffcd87d27a5c949f8d174b5fd780 SHA-256: b011ca453cfd8962a45e78bdd07805ecd9a1b243f1b0773d673fd95e2b168ed7
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to 'how to make vegan burger from scratch', directing users to malicious URLs.

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://bologen.ru/123?utm_term=how+to+make+vegan+burger+from+scratch PDF link annotation
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/4909534.pdfIn PDF document text
    • https://nugibunexediga.weebly.com/uploads/1/3/0/7/130740514/7e2ca2e.pdfIn PDF document text
    • https://bipinudaw.weebly.com/uploads/1/3/4/7/134718108/fediwiwof.pdfIn PDF document text
    • https://cdn.sqhk.co/kazaluxi/gcjhqhb/36788188507.pdfIn PDF document text
    • http://losewunisa.22web.org/12007171680.pdfIn PDF document text
    • http://bbflowers.net/11612729452f44v6.pdfIn PDF document text
    • https://dufofumiwiz.weebly.com/uploads/1/3/5/3/135309849/jelaliniku.pdfIn PDF document text
    • http://rujawobezixevib.iblogger.org/bahay_katay_shareen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedisupekak.epizy.com/how_to_create_a_fax_cover_sheet.pdfIn PDF document text
    • http://febiked.rf.gd/91820850896.pdfIn PDF document text
    • http://fixelelediv.epizy.com/bakelite_sheet_manufacturers_in_pakistan.pdfIn PDF document text
    • http://sarirasa.epizy.com/case_580e_backhoe_parts_manual.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_off0000d014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD014 5580 bytes
SHA-256: abf63773a61574f989318e7d93fcf574cfb4a79bb38beee91ff88526bf259a52
font_01_sfnt_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 10492 bytes
SHA-256: 4255eff8f143f86ebeec16d29d28f7ff2248f20a0893578a322db0818b5d03a9

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