Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7054b4b623ff046…

MALICIOUS

PDF

72.7 KB Created: 2020-11-14 08:42:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40dec60ab5adb7dbf8def0bf024f0ae9 SHA-1: 1d3ebfdaaa0d10ca7d3daf0603e5ea8321f2e41b SHA-256: d7054b4b623ff0461248b15976517c1ad30ef438f2f70fd3afd5a31794043453
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. Another critical heuristic indicates a large PDF link farm, suggesting a coordinated effort to direct users to potentially harmful content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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-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/123?utm_term=palm+desert+hs
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/nixitegilamije.pdf
    • https://titawijuneve.weebly.com/uploads/1/3/4/0/134012454/4f456bcf1e1b4d.pdf
    • https://lumifuwuzuzeb.weebly.com/uploads/1/3/4/6/134698668/a364565.pdf
    • https://cdn-cms.f-static.net/uploads/4391015/normal_5fa326c9c81bd.pdf
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/5351f71.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kizugokofo/46200920279.pdf
    • https://s3.amazonaws.com/pujinit/biwenezemuvovofix.pdf
    • https://s3.amazonaws.com/zasepo/45378145636.pdf
    • https://uploads.strikinglycdn.com/files/d818b5af-cce0-4ed2-adf0-f820f8daf9d0/48787901913.pdf
    • https://s3.amazonaws.com/jafujasiwetid/definicion_de_medio_ambiente_segun_autores.pdf
    • https://s3.amazonaws.com/jenisozazewubo/playstation_1_games_instruction_manual.pdf
    • https://s3.amazonaws.com/wokesabisevo/74681540198.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c781.bin
aa3be4c1889b1e4363d276b195a84c60606c17756cadd34bb24b3b32ae9ff98e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC781 5064 bytes
font_01_sfnt_off0000d883.bin
172d5070da799b79fd3a5af3fe2b9c193ccd06cdd7038f7fa051fd1193b8b3e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 11912 bytes
font_02_sfnt_off000100c6.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 16204 bytes

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