Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4749f5dfaf3187b…

MALICIOUS

PDF

58.9 KB Created: 2020-12-18 09:29:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 914764acfa82df62f6d5cd7b3648365f SHA-1: 2aeed150d6fe19b9f478f398dfe021ab21a2da0d SHA-256: f4749f5dfaf3187ba326cbfdcf1176019b8a19a6e82fbf23c0a55bab47e5a9f7
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a significant number of embedded links, many pointing to disposable hosting or redirector services, suggesting a link farm or phishing campaign. The presence of a link to 'traffmen.ru' with a 'face painting stencils australia' UTM term further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • 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.
  • 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=face+painting+stencils+australia In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424025/normal_5fd9931ed529a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f8f2608a962e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_5f9dac6844154.pdfIn PDF document text
    • https://bilopoxowug.weebly.com/uploads/1/3/4/4/134439404/bf7619.pdfIn PDF document text
    • https://rebuxikaxaj.weebly.com/uploads/1/3/4/6/134668288/tumitorerawezib.pdfIn PDF document text
    • https://bosijoputa.weebly.com/uploads/1/3/4/3/134317673/nadizosadorus-damumivet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411246/normal_5fcefcb9a9dfb.pdfIn PDF document text
    • https://baxikulalul.weebly.com/uploads/1/3/4/5/134582220/2979381.pdfIn PDF document text
    • https://telanadiv.weebly.com/uploads/1/3/4/4/134495792/gaponuxak.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/vuraradaso/bedimoxuv.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_off0000ab9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB9B 5056 bytes
SHA-256: 0b8de633d5f9f07658f041fefa16f72819fe54d7e8eba7ec0ffef6952fd76e66
font_01_sfnt_off0000bce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE0 10188 bytes
SHA-256: 1f9d165a46ec064a8c957140c7450f0bb4ba3acf08e35d84ce8d2eae1dbeabd5

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