Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb56158327c798b8…

MALICIOUS

PDF

60.6 KB Created: 2020-12-02 15:03:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 741446a4b6c55ef539509e50f8ab5de6 SHA-1: 46b62011d711d8da1cb6a4034780e6d78280f704 SHA-256: bb56158327c798b8dbc8f15b134c863326bce62604501a099552c185cb6e18c6
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains an embedded URI pointing to 'trafficel.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/aws?utm_term=bus+stop+movie+telugu+songs+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410448/normal_5faee7e219254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413005/normal_5fa63f6404d33.pdfIn PDF document text
    • https://sozivawar.weebly.com/uploads/1/3/4/5/134511290/24659.pdfIn PDF document text
    • https://rurizurerenudiw.weebly.com/uploads/1/3/4/6/134649160/581283.pdfIn PDF document text
    • https://saferuwakuzav.weebly.com/uploads/1/3/4/6/134688645/1908053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_5fa98a9297e66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_5f8e6a2091143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_5fa395a896d04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428043/normal_5fa28d3923013.pdfIn PDF document text
    • https://xoxaworik.weebly.com/uploads/1/3/4/0/134012931/xakanuf.pdfIn PDF document text
    • https://kiroteveve.weebly.com/uploads/1/3/4/3/134378898/65b90ad2f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf533a08845d0924813546/1606374205127/68072157415.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/answered_call_emblem_destiny_2.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf58eb3c02f22b9d047107/1606375660254/kayak_sun_shade_for_dogs.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/adventure_capitalist_hacked_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/govipimavipamafukodivusik.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_off0000b05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05E 5120 bytes
SHA-256: 4e5071a4b323fabe5c7696f399b4dc9803b602cf2effd7fbbd2dced117303406
font_01_sfnt_off0000c1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CC 10408 bytes
SHA-256: 35312ecb4b599127678d59cd614b4e4ba558f657d74897a94ba4334579e2b606

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