Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4068007c6141c9f…

MALICIOUS

PDF

71.8 KB Created: 2021-01-03 19:48:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 51f643975e85d1e82cb4cd788cc30c15 SHA-1: 740a6277d5b44a01f38674271d5aa12675f47f3f SHA-256: d4068007c6141c9f219ab9f8843d1f5b1689553378961caddb9489966174996e
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one critical link to a known malicious redirector. This indicates a link farm designed to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/123?utm_term=solving+equations+activity+worksheet+gcse In PDF document text
    • https://vakigosem.weebly.com/uploads/1/3/4/4/134480352/6198abde7ef4fc.pdfIn PDF document text
    • https://lizakefamejoxen.weebly.com/uploads/1/3/1/3/131384135/77247928facc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5fb9b9e73ad3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5fbcca38e2abd.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/4286557.pdfIn PDF document text
    • https://paxowamowutujaf.weebly.com/uploads/1/3/4/3/134322095/puliwunik-fakukiwa-waxowevewi.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/RiOoijk/56612077722.pdfIn PDF document text
    • https://vefigemeg.weebly.com/uploads/1/3/4/3/134368147/4d79dccfe044.pdfIn PDF document text
    • https://cdn.sqhk.co/lunapolakezo/heuPjj9/12470349794.pdfIn PDF document text
    • https://vetudibe.weebly.com/uploads/1/3/5/3/135320479/rutitobaxemawuw.pdfIn PDF document text
    • https://wafulerafi.weebly.com/uploads/1/3/4/5/134503758/7e0e8882db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470412/normal_5fce506c027ba.pdfIn PDF document text
    • https://wevinavuligi.weebly.com/uploads/1/3/4/5/134505150/pugirewela-rugob.pdfIn PDF document text
    • https://gafapelisepofas.weebly.com/uploads/1/3/4/7/134762307/mawikuwu.pdfIn PDF document text
    • https://fosarujup.weebly.com/uploads/1/3/4/6/134624161/5b362.pdfIn PDF document text
    • https://mevenuma.weebly.com/uploads/1/3/4/3/134380719/kanevibasususowevoge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC810 5488 bytes
SHA-256: f32d14bbcfde7fa9d951815b68501e37b561a7808b1b6faa94f0dba1e4a1851b
font_01_sfnt_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 11404 bytes
SHA-256: 8905dd15f88497faccfa66b37a195a54e476a13aecd5bb00ec2d409cc753177c
font_02_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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