Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdaf298371b03ed…

MALICIOUS

PDF

77.7 KB Created: 2021-02-28 19:27:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fbf638adc649d715d37a954c73f0dfd0 SHA-1: e97c45fbdd359937fd81d68746fc61f533b1bdc2 SHA-256: fbdaf298371b03ed51e82f6b15784ceb4748ec70034f8cf38afbb99cd9a43c33
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. Heuristics indicate a link farm structure, and ClamAV detection confirms maliciousness, classifying it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9291

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://maypoin.ru/award?keyword=suzuki+intruder+vs800+manual+pdf+free PDF link annotation
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/1731372.pdfIn PDF document text
    • http://numexomo.iblogger.org/nes_emulator_pc_free.pdfIn PDF document text
    • https://ruwiwiteviporiz.weebly.com/uploads/1/3/4/7/134767377/sokov-tonozelufasa.pdfIn PDF document text
    • https://cdn.sqhk.co/xewumoxu/fia00ie/33081667435.pdfIn PDF document text
    • https://cdn.sqhk.co/degavorofala/dD0I6II/81583717815.pdfIn PDF document text
    • https://kimubewej.weebly.com/uploads/1/3/5/3/135329621/mamonebotuna.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/zjghDig/zatodofomaletifekarezis.pdfIn PDF document text
    • https://cdn.sqhk.co/guxudakakali/hhUJhgM/troom_troom_en_espanol.pdfIn PDF document text
    • http://masonufidowex.iblogger.org/format_of_report_writing_in_english_cbse.pdfIn PDF document text
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/3031640.pdfIn PDF document text
    • https://cdn.sqhk.co/juzivadareka/djf1hhU/pufuvegubutuvuwexeb.pdfIn PDF document text
    • http://wifusibumamoj.iblogger.org/83416805741.pdfIn PDF document text
    • https://xasigali.weebly.com/uploads/1/3/4/3/134363336/gofinedav.pdfIn PDF document text
    • https://cdn.sqhk.co/tafolaku/gjchjif/95609743710.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/zesixefe/10094259840.pdfIn PDF document text
    • http://viwuleraxukopiz.epizy.com/63958696863.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/masters_of_public_policy_salary_canada.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 5800 bytes
SHA-256: 47886e72e62cb0074c5db7bc959f9ca01e375672045a1a9986c07d4cf2b2d8e3
font_01_sfnt_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 10636 bytes
SHA-256: d5dd32f8c9ca2423cb83dadd670ea6d5867d529c0c78b0647adfca9304cbb569
font_02_sfnt_off00011d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D83 16344 bytes
SHA-256: ed45a24507f18daeaf6b6e9cac20235e9e43bed88bc2d44b7621eff085e31190

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