Malicious PDF — malware analysis report

Static analysis result for SHA-256 670f27931c9dcaff…

MALICIOUS

PDF

80.8 KB Created: 2021-03-21 09:52:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f24044daf2041e7f2fcf5dc2b333c562 SHA-1: 34420953c19d4a9d5c187f6863212881dd9d9855 SHA-256: 670f27931c9dcaffbf08dc070c68fa710b99ad6ce8632f316157c1a3799bbdea
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, pointing to various PDF files hosted on external services. The primary malicious URL identified is https://mezovuduw.ru/123, which is likely used to host phishing content or distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://mezovuduw.ru/123?utm_term=cha+cha+real+smooth+barney+meme+template PDF link annotation
    • https://wumupokurura.weebly.com/uploads/1/3/0/7/130776197/xapogubexetolofimax.pdfIn PDF document text
    • https://gerasulas.weebly.com/uploads/1/3/4/8/134861388/kijepededoxoxu.pdfIn PDF document text
    • https://pedagojewixa.weebly.com/uploads/1/3/1/3/131398360/dafol.pdfIn PDF document text
    • https://falojabuvo.weebly.com/uploads/1/3/4/7/134774067/zulusobasurojesixe.pdfIn PDF document text
    • https://buzotenugi.weebly.com/uploads/1/3/1/4/131408099/ruwej-vijulokudep-lesej.pdfIn PDF document text
    • https://xakowuval.weebly.com/uploads/1/3/5/3/135316831/kubosirivisuzivijati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446789/normal_603ebbd865b1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fd7f92f8cba5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_0272f5202af8492b94f05f0ce1a41521.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petubapizo/degabobikum.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/48414466560.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/61362776416.pdfIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_749bf12f00a0448bab9b2abda30c0091.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pomaxa/23384923486.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/jibinora.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/guidelines_for_cervical_screening_in_new_zealand.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/60738960648.pdfIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_66a392cd64644715af4a3a083f355195.pdf?index=trueIn 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_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 5320 bytes
SHA-256: dc7b16977101361ef96dcac2233e43c0f4f09f5ffb14be2c9f68a9a7a6387f41
font_01_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 2060 bytes
SHA-256: 51ba63bd51bb39a37d037d1e7d76240c59921393468d3066bd3b7b4b9f6065da
font_02_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 12152 bytes
SHA-256: 13282a6c308792bac248e66db96b317b2cb5bd3f6066dae461f9d3034d9beac4

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