Malicious PDF — malware analysis report

Static analysis result for SHA-256 3561847f388426ce…

MALICIOUS

PDF

74.6 KB Created: 2021-01-29 15:56:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 39fda9f07c72123073dd9e4f07b6aa12 SHA-1: 261f3be205c9b4d81a001714ddd8cdcb1bf30bb0 SHA-256: 3561847f388426ce65d21227b9f91751a77f13737b0977d120aaf8c6b56067ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document contains a link farm with numerous external URLs, including one pointing to 'bologen.ru', suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, though not fully detailed, indicates potential for malicious execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/123?utm_term=2015+nissan+altima+repair+manual+free+download PDF link annotation
    • http://nakozovuzu.22web.org/aatish_full_movie_mp4_hd.pdfIn PDF document text
    • http://aycotoro7.xyz/83620219312tmuj4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495058/normal_5ffcb9f721270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_601098c229427.pdfIn PDF document text
    • https://zotawirimatoxo.weebly.com/uploads/1/3/4/0/134096886/nofobupesofozexudiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419847/normal_6009bb28b5dfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369788/normal_600ee4eb5b352.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/apj_abdul_kalam_english_information.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/81269651048.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/anakin_skywalker_transformation_to_darth_vader.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/8253797336.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/que_es_auditoria_fiscal.pdfIn 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_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 5636 bytes
SHA-256: 1a8da20bcfb3dc5438f0467122925ddb5bca20c6026f8815041d69b6073a791e
font_01_sfnt_off0000fa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 10492 bytes
SHA-256: f2e997bb2344fc84d2a80d916410a6897cc4468f667b093ccc181be0e738ab98

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