Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca824f315526e98b…

MALICIOUS

PDF

71.6 KB Created: 2021-04-14 05:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4dda314d216d990dc2cb9b06d3c50197 SHA-1: eed00b4bc4a55896f6e0a485ebf6d68f5053b982 SHA-256: ca824f315526e98be0b75dbba4fcae58d7cf7f952710670dbec8350d7de9fe92
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, a common tactic for SEO spam or phishing. The embedded URL `https://seumenha.ru/strik?utm_term=black+max+6560+generator+air+filter` is likely the primary lure, disguised by the document's content. No scripts were extracted, but the PDF structure and link farm suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/strik?utm_term=black+max+6560+generator+air+filter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487647/normal_6064b43db199c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_6066b9e2c26e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_60300e85eb5c9.pdfIn PDF document text
    • https://lubukapilibuvi.weebly.com/uploads/1/3/4/0/134095968/4673032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_600f2dbc78ba6.pdfIn PDF document text
    • https://makaxifosezopuv.weebly.com/uploads/1/3/4/5/134511124/kuxezovefapi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502436/normal_5ff0cc5d645d2.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/61c5dea5-68d3-4667-8d46-0db66f692db4/44874629140.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/41619450808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d844479a-e97a-450f-ab33-ef01aeddc2ab/celestron_astromaster_114_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/libro_de_dinosaurios_para_colorear_gratis.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_241bba989cef41a2a3e6ada463283894.pdf?index=trueIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_708bc39457fa432c8bf32d3ccbd5711a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legenapi/60263341220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93b69f2f-e795-4468-852d-9d6566088d35/78972615615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27fb6db0-409a-44e9-bb4f-b5b9689d2269/tujuvedu.pdfIn PDF document text
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_a47bf933768d4d99a0e000cfa96b154f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/first_alert_carbon_monoxide_detector_manual_co410.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/59247702637.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/bts_world_mobile_game.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/how_to_use_a_2_ton_hydraulic_bottle_jack.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_off0000d962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD962 5624 bytes
SHA-256: 9676af38369b7726970161309ae08b948228aee7e29657e77b34fe3fba0aba9c
font_01_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 10564 bytes
SHA-256: 9ab9489d2486b3057a8ea9c3d19ad9806bb887db05ba52b08d19209bc328c218

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