Malicious PDF — malware analysis report

Static analysis result for SHA-256 45df0ebf75ac4c33…

MALICIOUS

PDF

97.8 KB Created: 2021-01-02 02:59:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4b5b31edcbaffe43e59bae5153197bdc SHA-1: 86e446d136d11b3f8ccd796b71785e35cb384091 SHA-256: 45df0ebf75ac4c3369dfc53e32343524de3f6749a38dde4d1d4f58aaef012944
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a high-confidence ML classification. The document contains a large number of embedded links, suggesting a phishing or link-farming campaign. The primary malicious activity observed is the redirection to external URLs, which are likely used to host further malicious content or phishing pages.

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://traffmen.ru/123?utm_term=jl+audio+10tw3-d4+enclosure In PDF document text
    • https://jukovuwivoxufab.weebly.com/uploads/1/3/3/9/133997180/vebidinonak_kisuvu.pdfIn PDF document text
    • https://newadagunezadev.weebly.com/uploads/1/3/4/6/134684801/mezazegaburaralone.pdfIn PDF document text
    • https://degusatujetuz.weebly.com/uploads/1/3/0/8/130813325/fbdca1908e.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/haggrge/random_character_name_generator_wow.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/Figctjf/aaron_rodgers_age_girlfriend.pdfIn PDF document text
    • https://cdn.sqhk.co/boketumejipa/jjXhfhg/homemade_wedding_cake_decoration_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/3KijpJA/learn_easy_ballet._online_dance_classes_free.pdfIn PDF document text
    • https://tebefatudu.weebly.com/uploads/1/3/4/3/134329870/pafumabok.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/PZhhnyQ/xatexozenapukoferi.pdfIn PDF document text
    • https://cdn.sqhk.co/vagewovupug/gIiijgh/pavebo.pdfIn PDF document text
    • https://gapuropiti.weebly.com/uploads/1/3/2/7/132740804/3623556.pdfIn PDF document text
    • https://cdn.sqhk.co/wumigapinido/eEnEPji/51261238288.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/fowonaxul/77721017111.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_off00013f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F40 5492 bytes
SHA-256: 0189d6a8fe8d478f5812836dfd45087097438c5a5ce3828edd8fea119183d89e
font_01_sfnt_off0001521e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1521E 11808 bytes
SHA-256: a652f02d016d29d9539055069866c77ca5c61d6156f0ac7e2384f85422b9a758

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