Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c36ba42aa87e4b…

MALICIOUS

PDF

62.1 KB Created: 2020-12-18 15:05:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fca52866eab142f20972f60764cfe6df SHA-1: b55c9b03ad39055ddafa3fc081e0c64d0507a7f8 SHA-256: 89c36ba42aa87e4b05bae612dcdeebb05a170593297e0ce493bf17f4f04d5f07
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation scheme. The presence of multiple external PDF links, some with unknown reputation, indicates a potential distribution vector for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://trafffi.ru/aws?utm_term=color+combination+chart+pdf PDF link annotation
    • https://sitepofom.weebly.com/uploads/1/3/1/4/131438718/c050b8b7135a60.pdfIn PDF document text
    • https://jawibonudinozof.weebly.com/uploads/1/3/4/5/134584949/zefirobolefijofuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445726/normal_5fb6f3779bb89.pdfIn PDF document text
    • https://wisizexabebaj.weebly.com/uploads/1/3/4/4/134461468/6159261.pdfIn PDF document text
    • https://zikenanevo.weebly.com/uploads/1/3/4/5/134589255/2781964.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/7721246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485710/normal_5fd9cdfccb1cd.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/2a590b64-427a-432d-9e14-325f72f6ffaa/wujetiguwivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e4b9e0-fce0-423c-8e82-e6158b9c8969/deck_building_guide_clash_royale_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f01f543-2bab-4b1a-aa76-c435602ace00/ming_hing_naperville.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/kinesiology_biomechanics_and_sports_class_12.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/hangout_apk_for_android_4._0.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/10203782901.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_off0000b810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB810 5260 bytes
SHA-256: 9a13d5364ffba8fc7158ddde45c1c7a8383fa2896359f40f8b5b8bb3570f94b7
font_01_sfnt_off0000c9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BD 9868 bytes
SHA-256: 38411b35e18e661addf9e6ba29ce775ee42b6a4d1c88b36c08910315078b6520

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