Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9df0bb4b65d1ff…

MALICIOUS

PDF

59.9 KB Created: 2020-12-16 10:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 96a2222943138a5316b19001ba013bf2 SHA-1: f90917115893b18aec4ea7c7a55ccbfc33ca2778 SHA-256: 5a9df0bb4b65d1ff21b825c47c29852bc402a9bb1bc8d676e353b8f6a60e15d6
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary malicious URL identified is 'https://ggtraff.ru/strik?utm_term=mixed+nomenclature+worksheet+%25231'. While no scripts were explicitly extracted, the PDF structure and the malicious URL strongly suggest an attempt to lure the user to a compromised site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ggtraff.ru/strik?utm_term=mixed+nomenclature+worksheet+%25231 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476939/normal_5fbc29347ae36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413843/normal_5f97529c0b0c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449421/normal_5fb93dcce17c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378405/normal_5fc3b3bf9d5b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_5fa6658eeac92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486550/normal_5fd9053d77927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5f87b4af3dac8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_5fa816ff3b6cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5fc30afb1b7d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc1771924b06a7eb3033110/t/5fc53c103485235c86710d0d/1606761491841/tawobevuluwejowiminoja.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/vidyapati_ki_padavali.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe20873f75b166439dfddf/1606295688015/black_butler_season_1_episode_11.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd3261924ca37bdf9e8f74/1606234724630/human_life_cycle_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/associative_memory_in_computer_organization.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a3195e8e827d4299026a/t/5fc3b09e9b1ed035384db666/1606660256743/79593086238.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf56c94e98326c020795bd/1606375118572/79307194053.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfd72ef3361272aec4849/1606221176649/19961964735.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_off0000b1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E1 5408 bytes
SHA-256: 6b43e3126ae92053d4eb4d57fdf1be8d5a6f4136e78c83969267759f06013d82
font_01_sfnt_off0000c437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC437 8988 bytes
SHA-256: 823bb6e5a2c57464c6f8ccfab6ce20202be84c70447da5f67fb43f6ee1de42a4

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