Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75ecb49bd5edc97…

MALICIOUS

PDF

67.1 KB Created: 2020-12-06 13:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 169710e82790c301c88237b92b0d6e69 SHA-1: 94d8976d9f516fe96afccd3e369f74e6d06023e4 SHA-256: b75ecb49bd5edc97d3621cc2c9a6c87f3b1f41ac3ecf80b11726b38a68cab67a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The embedded URLs and the heuristic firings indicate that this document is designed to redirect users to potentially malicious or unwanted content, masquerading as a resource for free books. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • 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://traffnew.ru/aws?utm_term=objective+electrical+engineering+books+free PDF link annotation
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/timafu-wevaxanarewo.pdfIn PDF document text
    • https://jijelejo.weebly.com/uploads/1/3/4/5/134590633/gekopokajadaxes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469143/normal_5fc5bdd5acf90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404966/normal_5f91d9e0dfb7c.pdfIn PDF document text
    • https://lomasegikuporot.weebly.com/uploads/1/3/4/8/134846826/xogimurinejamub.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/74584bd83dde3f2.pdfIn PDF document text
    • https://sokazavuse.weebly.com/uploads/1/3/1/3/131378988/zuliwiwerokivap-furepasijazu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502870/normal_5fc68c7b1986c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_5f8ce07930446.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/luroniwabukegu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453732/normal_5fcc2aad3c1d0.pdfIn PDF document text
    • https://nolalitikobuno.weebly.com/uploads/1/3/4/7/134768790/7721378.pdfIn PDF document text
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/bafepipitanug.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/novipaliwid/bedingte_formatierung_excel_2010_symbolstze_formel.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_off0000ca44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA44 5416 bytes
SHA-256: 3d0532aa0d2fd8a34c0141206a9dbc971ef38b48f1afc74d416856ceb63d6516
font_01_sfnt_off0000dccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCF 10228 bytes
SHA-256: 6f27a7ccbdb6027d6fbd400ddbb62117c4e32affc294f491dbb29644a134a865

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