Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb4bfd57d3a839b…

MALICIOUS

PDF

73.3 KB Created: 2020-12-10 00:11:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1b8d66dec7b018fcd7ba942a93e98785 SHA-1: 1b305b3de29a3b6bbc4f50a53f56b252f5858849 SHA-256: 4cb4bfd57d3a839b82b38fc146b35f2ac0ea57d20a6c93e8b552ff408e8a7d52
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains an embedded URL pointing to 'traffnew.ru', which is likely used to redirect users to malicious content or phishing pages. The PDF also contains a large number of external links, suggesting a link farm or SEO poisoning attempt to distribute malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/123?utm_term=ar+15+foregrip+bipod+review PDF link annotation
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/xinugaxinuz-xirizuzol-dewosatojabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425926/normal_5fa6906227ab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450730/normal_5faed47247459.pdfIn PDF document text
    • https://datojulimiwijo.weebly.com/uploads/1/3/4/7/134708787/4525789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402944/normal_5faa0be23b11d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/graphing_linear_systems_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/7526894435.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/31401695831.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/eyfs_teacher_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/32654263474.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/buffalo_wild_wings_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/zizasudonikajadidive.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/suwiwotimidenaxoto.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_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 5248 bytes
SHA-256: 4fee2ed2b5c84984837ff4f53cb411efbd5589e01bf8ac4fd525f85d09991dd0
font_01_sfnt_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 11008 bytes
SHA-256: f3119f70d1ab8874994ac82999ec3147d1b73d05380ed1296e15ff94431a0fa9

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