Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1f5cbcf9aef75a…

MALICIOUS

PDF

68.7 KB Created: 2020-12-20 21:56:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c039bc31511da9e5a770e5d956dbb30b SHA-1: 9dd738e9274271b258f8cdf1ca4586eb53067064 SHA-256: af1f5cbcf9aef75a4c28be84e2a2c3cef1248dba8085ec74af72c0ea07aa804e
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document's structure and embedded URLs are sufficient to infer a malicious redirection attack.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/strik?utm_term=marginalia+billy+collins+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_5fab3cd5ece60.pdfIn PDF document text
    • https://pezopipowom.weebly.com/uploads/1/3/1/4/131406060/d4f70825.pdfIn PDF document text
    • https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/danogabugepe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495262/normal_5fc5176be5f36.pdfIn PDF document text
    • https://jefifekelu.weebly.com/uploads/1/3/4/7/134744422/0c1ca60.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/fulosobezur/89558128303.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/9655553760.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/duzud.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/exercise_technique_manual_3ed.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/73634237849.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/rizusuvigekomufoxebagezug.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/clauses_and_phrases_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/zadugikesubutil.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_off0000d05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05A 5568 bytes
SHA-256: ba67757f4f9e795e3337fbcc38aeb7205d5d3b82ac4f4c352a24a87e13983e62
font_01_sfnt_off0000e368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE368 10320 bytes
SHA-256: 94af10030afa2cf76062e4914d3c1b945bb70cb18be4aa32fcfac2f780a75b03

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