Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efb1b2b7b43e44b…

MALICIOUS

PDF

67.1 KB Created: 2020-12-08 06:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f084c21181784cb2379198a18e24652 SHA-1: 6a0078c0d4f8c5820bbba32cd230afdc4f9b3789 SHA-256: 6efb1b2b7b43e44b0bc8317965b3eea66bd1137bb1a544765155347637bebf40
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV also flagged this file as malicious, specifically indicating phishing and trojan characteristics. The presence of numerous external links suggests an attempt to direct users to potentially harmful sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/wb?keyword=hln%20bleacher%20report%20hosts
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f9634822dc57.pdf
    • https://cdn-cms.f-static.net/uploads/4387562/normal_5f8d58e9b6c2e.pdf
    • https://cdn-cms.f-static.net/uploads/4445118/normal_5fbb00e57226c.pdf
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/b749c1b246c.pdf
    • https://xazaguzomolak.weebly.com/uploads/1/3/4/3/134375957/gawebi_jupema_lawoxuxelepu_vukidukor.pdf
    • https://vilujelirajoki.weebly.com/uploads/1/3/4/3/134378771/jonolupa.pdf
    • https://static.s123-cdn-static.com/uploads/4489429/normal_5fc6158211706.pdf
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5fc3986b8635f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3e3d9801-6c0b-42eb-8811-777eb98dbd89/60358305457.pdf
    • https://static1.squarespace.com/static/5fc505c01c8c7413144c6c55/t/5fc9b629ec1d586fb38aaef7/1607054890635/48497838810.pdf
    • https://static1.squarespace.com/static/5fc554acbd14ff0dd2ba05e0/t/5fc5ef9c08845d092457cb4c/1606807453026/31725118394.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe2dec9d7936484058a991/1606299119356/is_mineral_oil_polar_or_nonpolar.pdf
    • https://static1.squarespace.com/static/5fc4e907ec917750a3f1629c/t/5fc5654908845d0924401c98/1606772041862/hp_envy_case_17.pdf
    • https://uploads.strikinglycdn.com/files/fba060b1-b09e-4a97-877f-bf26aa5dc088/dottis_weight_watchers_restaurants.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9d4.bin
5cb32c6f035ec3998503334ff837b57e5cdbb65223cb0aca13398306d650535b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D4 5124 bytes
font_01_sfnt_off0000db2d.bin
8ab9e64f6c7e68ef243b17b23620eed5c0cd5aa2a1a8208e0d85de5bb37bd11e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 10788 bytes

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