Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2b609926c6686b…

MALICIOUS

PDF

74.7 KB Created: 2021-02-18 17:18:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3fbcb8eac9d8cf6c53e9e57f637343d5 SHA-1: d5f41fad8087d77cfcbe3f454e2725b0ac2aab11 SHA-256: 4e2b609926c6686b9ef37767bd37197f0cc9a6a7d821c776d525bfdc6db5c656
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file exhibits characteristics of a link farm or SEO spam, embedding a large number of external links, many of which point to other PDF documents. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these linked resources. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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://seumenha.ru/123?utm_term=1000+places+to+see+before+you+die+usa+and+canada+list PDF link annotation
    • https://cdn.sqhk.co/jokawefezo/6idifhg/dominos_pizza_near_me_hours.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482623/normal_5ff7de0ae001f.pdfIn PDF document text
    • https://cdn.sqhk.co/sijiposago/jbkv2j6/98378239153.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458833/normal_600818cb8a2af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464323/normal_5fe914ff75af6.pdfIn PDF document text
    • https://lufeziwupidel.weebly.com/uploads/1/3/5/3/135345985/8149343.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366632/normal_5fe12cc5e7b4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5fd0a44716fc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_602c2aa52991d.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/Rjbgjiu/90485485428.pdfIn PDF document text
    • https://cdn.sqhk.co/vojazodelud/WLjaIXn/96423765872.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/suxugipipolazog/lockpicking_wow_vanilla_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/what_does_a_peq_15_do.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_off0000e425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 5488 bytes
SHA-256: 56c42ba046461ab494c2ff0ce4c1ff541eec096db51dd0d33d7f1e17edc4849e
font_01_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 11076 bytes
SHA-256: b65ce0643c48de6a41cef0a8709da5cd2e01e3e10279bbf07c48883da7706a26

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