Malicious PDF — malware analysis report

Static analysis result for SHA-256 c913015d4e37bba6…

MALICIOUS

PDF

69.3 KB Created: 2020-12-21 23:29:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 10e7d9c875a2dad3798757640fcfe212 SHA-1: 9d3c900f645864df7d7f0d69dcedf78330928f1e SHA-256: c913015d4e37bba639ec7a67730d499aff214324601a2803785f4f1b9c157833
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, directing users to a suspicious URL. ClamAV also detected it as a phishing trojan. The embedded URL and the heuristic for a link farm suggest an attempt to direct users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/strik?utm_term=good+podcast+stories+on+spotify PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446400/normal_5fa6555feab8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383156/normal_5fde1144f0ab0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427086/normal_5fc47295265b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417527/normal_5f95e44f35119.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/fapufesofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459162/normal_5fd0f1237aefc.pdfIn PDF document text
    • https://pilinuxuxip.weebly.com/uploads/1/3/2/8/132814996/zefojevez-sefebafevikowus-likovujoxobo-fowufutepevaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dobikasukavu/44742939892.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/64800485410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c77b9ec-2d07-48db-9d46-4b6102f589ea/1507962848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb678711-3a73-4b8a-aebb-67b9e6d3b8e1/61130616225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bdb340d-74bb-494d-9f0c-e77ff05be5e2/testament_of_youth_livro_em_portugues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22068f7e-c634-47a2-b74d-a9bb4d6b842a/70796937030.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A2 5040 bytes
SHA-256: 2304f85dc12b7aa73f2c16c30e820a6a039a011ca138ddf32d6b6d2ec94be83b
font_01_sfnt_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 10328 bytes
SHA-256: df05a08b37a2c3270154268c60465b34f8625e1d914c7d3d6d41508983be7312
font_02_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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