Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8db81c3cb7bc4c…

MALICIOUS

PDF

70.9 KB Created: 2020-12-14 05:14:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c4613b3243b3f51bf6777fcb153f9f81 SHA-1: 7e9d7725195a3afe2e7eb5e5872f9e9cc7e7f818 SHA-256: 2a8db81c3cb7bc4cb927355fe4566ffd1f4b30252dcd481b7c022a2548a0f32b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to 30 external PDFs. One of these links, 'https://trafffe.ru/wb?keyword=interim%20report%20em%20portugues', is flagged as suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/wb?keyword=interim%20report%20em%20portugues PDF link annotation
    • https://furevevesegino.weebly.com/uploads/1/3/4/6/134653878/sirewelawokep.pdfIn PDF document text
    • https://gulawunobuxag.weebly.com/uploads/1/3/4/6/134627092/pabapajeja_vaporutikogaze.pdfIn PDF document text
    • https://vivifaxokuz.weebly.com/uploads/1/3/4/5/134511129/4c303ab0526.pdfIn PDF document text
    • https://lisamotakix.weebly.com/uploads/1/3/4/3/134308999/1478969.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/titugome/honorary_life_member_certificate_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e22c814-dfcf-494b-bc4a-bba2e03e4c14/63578026890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f49edb4-257d-48ab-9544-ce8170ef9561/sadonebasepaxopiv.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a58c40f1034a5cb42298/t/5fc6eff2c953717e09caeced/1606873074925/21954953356.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0bb6f3de5e49b52b7447/1606290358996/14350662749.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/flat_platform_sandals_asos.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/27998690235.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/mokogabo.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/chimera_tool_cracked_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/definition_of_human_resource_development.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd008c14dfd36feeb1b6e/t/5fc1608ebc819f1cf40bf1e9/1606508688940/squirrel_hill_library_jobs.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB913 3120 bytes
SHA-256: 1ad02b79c7091a558633aca35b79c18c4801c8f97407e2d39b41a6bac3159f63
font_01_sfnt_off0000c446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC446 4832 bytes
SHA-256: 08583e0a2a5cd5ebc5a6d6eb41fd36aec2eff17febacc63a9469701a30deec81
font_02_sfnt_off0000d4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A7 11184 bytes
SHA-256: ca24ddc7fd0eeeebafe2502e9a02b7974db8c2a273e9d6c02b21334a98389a23
font_03_sfnt_off0000f96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96A 16068 bytes
SHA-256: eaa138153142e1b202f6e132b5b79d2ae4483da1523e62d7c19f47fa5ad289e7

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