Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e86637c3709aa0d…

MALICIOUS

PDF

77.1 KB Created: 2021-02-20 17:18:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e3823f2a792b463a65900d7ae1c889bc SHA-1: 72b924b3c75003d273c11e16579ca8150068d749 SHA-256: 0e86637c3709aa0db9e1c14999ea171a3a90de3d8b774047d651803ae882403c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing campaign. While no scripts were extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=what+are+the+different+types+of+taiko+drums PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465396/normal_5ffc31431c9ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376126/normal_60254c17e2861.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402722/normal_5feb6c9636f61.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/EmGvBha/5003885072.pdfIn PDF document text
    • http://cupe1.ru/bonututo2au3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498324/normal_5fc7faca4711c.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/ix9FPcv/14074660765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_602d44750f2a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_602efa0fa76c8.pdfIn PDF document text
    • https://cdn.sqhk.co/dopebuxoz/Hgcqidt/68319718452.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/iSI90je/texijejovemedev.pdfIn PDF document text
    • https://kegozogoro.weebly.com/uploads/1/3/4/5/134525602/sebatuxurumuxeru.pdfIn PDF document text
    • https://cdn.sqhk.co/rowazazapa/3igxjjM/rolemi.pdfIn PDF document text
    • https://cdn.sqhk.co/gumojitoxowu/gesjajj/50155879128.pdfIn PDF document text
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/200531.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 5428 bytes
SHA-256: e7e5e3850b5da831ebaef40f3d7914c498055ec66df4b589b0ab0b691b5443b6
font_01_sfnt_off0001044f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 10196 bytes
SHA-256: 12fa111aeb295ab592b7b6c5a6598313e4c360809c0e2a6ef918a4fa7da84a5b

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