Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab45bab064bcd881…

MALICIOUS

PDF

101.9 KB Created: 2020-11-25 18:49:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7cb7ba7b03ee33729130f168181eee09 SHA-1: 7a219163d1adf3b406cdbe1985236be489117531 SHA-256: ab45bab064bcd8812bb8ff0f6cfb650add6584632f0dcd43602fb6d67ddee436
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, hosted on disposable domains. This is a common technique for SEO manipulation or to redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/123?utm_term=hawaii+hot+spot+worksheet PDF link annotation
    • https://tubomomumaxef.weebly.com/uploads/1/3/4/5/134508744/xilevudu-vakififope.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/4172681.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/5fabfae40caee8.pdfIn PDF document text
    • https://kafubururi.weebly.com/uploads/1/3/4/2/134235359/gisatedejevebiwemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405419/normal_5f925c54a8c5e.pdfIn PDF document text
    • https://tekipagitew.weebly.com/uploads/1/3/4/8/134871071/9c7343fd1464.pdfIn PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/edf0fdaabdb5.pdfIn PDF document text
    • https://fopidezajot.weebly.com/uploads/1/3/4/6/134688075/mikorurokogebu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_5f96904b772c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405208/normal_5f97d8ea136f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5f9a63c09e997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_5fb3c575c5d31.pdfIn PDF document text
    • https://xupotigoxurope.weebly.com/uploads/1/3/4/6/134657266/nesobofawodanejelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_5f912aab38d18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00015118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15118 4992 bytes
SHA-256: 432488c48eec9a6b7cdadbf9e672a71c6f25d621139bfea19bb8a63c776bb64c
font_01_sfnt_off0001621c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1621C 12216 bytes
SHA-256: d703fad396778ff27cb408210ad2ce8d6a6dde809a6ad48e807cc2b9c2ca5508

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