Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91d13b62f45bf29…

MALICIOUS

PDF

59.3 KB Created: 2020-12-20 07:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e237bc607842fc6a8c39a677464a1794 SHA-1: 962dc0fd2080227cf625f7153052f579e3b9ebc9 SHA-256: f91d13b62f45bf29f8ae1df30eecf57f71e2ad29482adfcc9e0cd9bb14b2f5e1
244 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 embedded links pointing to external PDFs hosted on various domains, many of which appear to be disposable. One critical heuristic indicates these links lead to known malicious redirector infrastructure. The ClamAV detection and ML classifier also flag this PDF as malicious, likely due to its link farm and redirector behavior, which is a common tactic for SEO manipulation or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ggtraff.ru/strik?utm_term=sonic+corn+dog+nutritional+value In PDF document text
    • https://xutifivaluladar.weebly.com/uploads/1/3/4/3/134337767/gajuxipewi-pagopexufagaj-zawezuzirenudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443329/normal_5fad59f20f05c.pdfIn PDF document text
    • https://pakoverixofe.weebly.com/uploads/1/3/4/7/134771358/pefasod-dogidokagijet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_5f957b3a3d1fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462351/normal_5fc4c407e6a18.pdfIn PDF document text
    • https://wotemaruli.weebly.com/uploads/1/3/4/3/134366333/d890e7ec.pdfIn PDF document text
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/biwivisi_gupuselaxi_bonokipuwel_kofinulomomote.pdfIn PDF document text
    • https://wazeketarawowaw.weebly.com/uploads/1/3/4/5/134587567/nunatupagedolo.pdfIn PDF document text
    • https://zidifupo.weebly.com/uploads/1/3/4/4/134475425/silawuwarod.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/287384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444622/normal_5fd914ee286ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446027/normal_5fb8a32d6ad42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6350cacd-3eb2-4d86-a3d3-a974431371c8/38613818692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eeb73f2-164a-459e-982a-ddbe259f01af/rurorolexokipizofogifajow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aa75125-a129-499f-829f-b8b9359d90b2/pugonikofojijuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af5f63e6-b6ce-4eed-bddd-cffa326eadc3/5349301815.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_off0000ad84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD84 5092 bytes
SHA-256: fb2fa737a95562b11c5c81c0ec00707c9387df64b5ae80ba0b51ec66b18e8f21
font_01_sfnt_off0000bee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE5 9784 bytes
SHA-256: c3c7aa623f82e8f416e1409c6744c81df740995a21fb036fdd54d2a1e28a1ce3

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