Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8684fdfcb1965f6…

MALICIOUS

PDF

67.1 KB Created: 2020-11-20 06:02:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1ef56c1081e7b228bd02f249d87172c0 SHA-1: c822dcd63b98f41cb113357e7dde2a10e77611ea SHA-256: f8684fdfcb1965f615f4631bb3fbdb6446018beea233b4a4cb6304e5943f1bd3
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=vshare+apk+ios In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5fa5c51847870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372086/normal_5f9431fda11bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_5f9d656d3ae22.pdfIn PDF document text
    • https://vuwuvaxurig.weebly.com/uploads/1/3/4/6/134649086/pafep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491414/normal_5fafe6fb5be29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5f966663c5363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392215/normal_5f8e6b96e8734.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/luvepasukewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_5f9f3b63a620d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f879ffd524e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_5fb32fa4bf907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5f8a5bdb24b19.pdfIn PDF document text
    • https://mixekolasum.weebly.com/uploads/1/3/4/3/134388380/jivojuz-larijof-gaxega-napigoses.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_off0000ca7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7A 4904 bytes
SHA-256: 1033f6c6f02463581a1a6726389379ded03b3698761be74b20dec4c8438e2c1b
font_01_sfnt_off0000db24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 10828 bytes
SHA-256: 28d041aef00a9ce74c0577890c70906e0222d4edcae698ec7cbf8e9d9e2d77d5

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