Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbe9463223fe7ae…

MALICIOUS

PDF

77.5 KB Created: 2020-12-02 22:18:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa611d7167123e8ee326dd7ff464b829 SHA-1: 7b32b9bedba74e7008c32ac73fa34fa449bbb4dc SHA-256: 3fbe9463223fe7ae3fec6195e224464682f6ac7af4291400bb97a22b10aabdfb
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate this PDF is designed to redirect users to potentially harmful sites, possibly for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?utm_term=honda+gc160+pressure+washer+pump+parts
    • https://cdn-cms.f-static.net/uploads/4369779/normal_5f915cf5a2263.pdf
    • https://tozarezev.weebly.com/uploads/1/3/4/3/134374844/nepoxedesamaviwoli.pdf
    • https://cdn-cms.f-static.net/uploads/4427077/normal_5f9d96d55a6b9.pdf
    • https://giguwazepijev.weebly.com/uploads/1/3/4/8/134870268/2b3b3607.pdf
    • https://cdn-cms.f-static.net/uploads/4453885/normal_5faf333ceaf49.pdf
    • https://cdn-cms.f-static.net/uploads/4391898/normal_5f947bba4a784.pdf
    • https://cdn-cms.f-static.net/uploads/4413008/normal_5f9da36cdaed7.pdf
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/raberuvemosuki.pdf
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/mekadiruda-masiletep-tuxasemepabe-rofevixibap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/takurugilij/bumaze.pdf
    • https://static1.squarespace.com/static/5fc518c716f6d44b07d9a43f/t/5fc6ee85efc65c5b7a350f96/1606872710264/dropwizard_metrics_annotations.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ae.bin
a9f24f88b9719d58f3ace44ee57fd0c8895e3d8988a152448b6d2f2fdb95d129		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 5688 bytes
font_01_sfnt_off0000f5ec.bin
a07faf199280c785fbd06328852ba1dd8fdf232f8e1a88013a3be7e0364064a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 10824 bytes
font_02_sfnt_off00011af2.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 4324 bytes

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