Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a39539da8cf7f6…

MALICIOUS

PDF

76.9 KB Created: 2020-11-26 04:45:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 15f685769a5b6a6f6d3f180716c77ee2 SHA-1: 383f078cf8e39c1209921850ccb396dd6e56387d SHA-256: 42a39539da8cf7f637cc8096a1a8f5b417700e65d1646b6a77c59d867a486136
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, with the primary suspicious URL being https://traffset.ru/strik?utm_term=mulholland+drive+scenic+route+map. The presence of numerous external links suggests a link farm or redirection mechanism, common in phishing or malware distribution campaigns. No scripts were extracted, but the PDF structure itself facilitates the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://traffset.ru/strik?utm_term=mulholland+drive+scenic+route+map PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391331/normal_5fbbfd2a4139b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f8bdcc7b0944.pdfIn PDF document text
    • https://jutawalafomas.weebly.com/uploads/1/3/4/3/134316275/nuwefaguf-saxarumubuxum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_5f99dd43aedae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_5f984dfc298ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387035/normal_5f9e2f2af16ec.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/38d1a07c-099c-49c2-9103-e2f73a6a5a6a/wayne_dyer_change_your_thoughts.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/pevobepelifuveso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/924c29f5-f2e0-421c-a56f-b124ed4fd98e/sedipesujobiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca603742-e94e-4ab1-8009-27bc25092400/pukesen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a19569ce-cb32-41c6-9131-c66a0631d2cd/youngs_modulus_of_wood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27bc91a4-1db3-434c-b724-ba1a596922b6/69744507380.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/little_tigers_song.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_off0000f202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 5380 bytes
SHA-256: f27e09ece8a8700d121296d22b95a5890a774b6d21ce7dfefa6df6e0d4afc1df
font_01_sfnt_off00010430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10430 10040 bytes
SHA-256: 57ff53c9aa79a1bda6d1a3ad171a0e96dbb21757061856ea651185243514a1b9

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