Malicious PDF — malware analysis report

Static analysis result for SHA-256 11df1a0d901e764e…

MALICIOUS

PDF

73.3 KB Created: 2020-12-30 20:30:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f90c74f7019f3a78d237e68c0d91ba2a SHA-1: 9804e246077ed44506f197e2c8ddc8a627768ff8 SHA-256: 11df1a0d901e764efcda002eac4df3add4a33f1da5b27cb4cc91c088045b3cab
156 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 external links, with the primary URL being `https://trafffi.ru/strik?utm_term=mineral+spirits+on+wood+floors`. This heuristic, combined with ClamAV detection and ML classification, strongly suggests a malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/strik?utm_term=mineral+spirits+on+wood+floors PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482418/normal_5fc2a8b4185b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_5fe92451e1bd2.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/J8Tujbc/tupujanenurulit.pdfIn PDF document text
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/895038f9.pdfIn PDF document text
    • https://cdn.sqhk.co/zopinulepa/iif1hbb/53522300837.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/zajagifeta.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/HhdlDMv/13018810523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5f986ef9bb2f8.pdfIn PDF document text
    • https://cdn.sqhk.co/zixajofazadi/F2jghb8/mechanism_definition_forensics.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/vesubodufisi/fajafevonikod.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/office_open_xml_document_to.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/zalatidigixunaranelugara.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/acid_arrow_conan.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_off0000e194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE194 5132 bytes
SHA-256: 91e1a21048ac7a2efd3783ce9a71037c57a60c86c42972f030257f535bd80a0f
font_01_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 10532 bytes
SHA-256: 25732ada7f85e485594cab21667419bf163c9a6b444f22cdb6a6d76599de8b7a

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