Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c18d10edf437ff…

MALICIOUS

PDF

75.2 KB Created: 2021-03-01 07:07:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 30b13fc114f19e312d80aba841e50dcd SHA-1: 665dea2aea148d834b76aa01369b7f9259590d25 SHA-256: c3c18d10edf437ffdedb167ccc3270e8c5d18b5710d40d49439f6afad7e88b35
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/wix?keyword=graphing+square+root+functions+worksheet+doc PDF link annotation
    • https://dirarogevuku.weebly.com/uploads/1/3/5/3/135351224/nokoridoger-zuwasenadugaxiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479212/normal_5ffaaf4e72631.pdfIn PDF document text
    • http://zokugorevat.mywebcommunity.org/68046105378.pdfIn PDF document text
    • https://dazuzidasepod.weebly.com/uploads/1/3/2/6/132681566/volifosatefevezebum.pdfIn PDF document text
    • https://penogefuf.weebly.com/uploads/1/3/2/7/132740618/8a6e6f38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_601b96ef8d5b5.pdfIn PDF document text
    • http://gasiwine.iblogger.org/35527045609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_600d79013c09c.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/97180309640.pdfIn PDF document text
    • https://suzagadagaxu.weebly.com/uploads/1/3/0/7/130775939/levurotu.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
    • https://s3.amazonaws.com/patotale/89615276690.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/horticulture_objective_questions_and_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC66 5580 bytes
SHA-256: 25658a6bf725b11120d1ee7767260449a9e9ab645a8b801e88eb444540600d6b
font_01_sfnt_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 10044 bytes
SHA-256: ae3b9fff69cee83712eca2912e286da99cdbfdc3fcadbe92ce4bda4984676e40
font_02_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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