Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64f672628226533…

MALICIOUS

PDF

67.7 KB Created: 2020-11-23 08:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbf44815a335af3a6a67c6e6588b7a89 SHA-1: 75b2eb1a41ea8370a0cad8e90a7bd51a9babfb02 SHA-256: b64f6726282265330bf9b8b3d8f542d71e37f5c080940eb6954b546e7c188ec7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'trafficel.ru', suggesting a phishing or link farm tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://trafficel.ru/123?utm_term=my+insinkerator+hot+water+dispenser+troubleshooting
    • https://xavozunop.weebly.com/uploads/1/3/4/3/134305705/3997186.pdf
    • https://cdn-cms.f-static.net/uploads/4370080/normal_5fb70f5ba2532.pdf
    • https://sevebara.weebly.com/uploads/1/3/4/5/134501605/xilumedi.pdf
    • https://cdn-cms.f-static.net/uploads/4393483/normal_5fa456966ba2a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vokeri/tomenutimonigewewavaf.pdf
    • https://s3.amazonaws.com/zuxadol/vedigizujujito.pdf
    • https://s3.amazonaws.com/rufonali/the_sleepy_poet_antique_mall.pdf
    • https://s3.amazonaws.com/rozebofukixus/java_8_for_linux_64_bit.pdf
    • https://s3.amazonaws.com/dapekufoxiraku/ohio_high_school_basketball_uniform_rules.pdf
    • https://uploads.strikinglycdn.com/files/3a571148-44ee-4c29-a1d4-3957bef96523/rabexasito.pdf
    • https://s3.amazonaws.com/wovigebi/veziwagobiritig.pdf
    • https://s3.amazonaws.com/lokijuronig/top_games_for_android_online.pdf
    • https://s3.amazonaws.com/lupebesu/bisection_method_in_numerical_analysis.pdf
    • https://s3.amazonaws.com/kavitokolezub/dutulobemexadatotosapujo.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_off0000cb61.bin
5551b941b945a9a20d16eb7021e9784f7d34b729f0d75e63fe1ddc987a634de2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB61 5624 bytes
font_01_sfnt_off0000dea3.bin
ea0d59d238e840b85ae4da8826adc04873a46df36bd24143fb28f01b5728df09
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA3 10272 bytes