Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a93b1b2c1bf3ec4…

MALICIOUS

PDF

77.7 KB Created: 2021-04-02 05:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f36b11e4927ad0ec6c05311013dd8a98 SHA-1: 62ecd159d3aa0f8e106c79ccb502d9c64d491979 SHA-256: 4a93b1b2c1bf3ec46b27ea13a79bf1b7feb346b1eea515e69271c86dfd26de4f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm or SEO manipulation scheme. One of the primary external links, 'https://baarspo.ru/strik?utm_term=big+fish+games+list+wikipedia', is a strong indicator of potential phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://baarspo.ru/strik?utm_term=big+fish+games+list+wikipedia PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382423/normal_5fe3825c91115.pdfIn PDF document text
    • https://jivenikovo.weebly.com/uploads/1/3/4/3/134308789/56dc1896907fd6d.pdfIn PDF document text
    • https://dajilifu.weebly.com/uploads/1/3/4/8/134891154/c7b991982b.pdfIn PDF document text
    • https://nakupibizotan.weebly.com/uploads/1/3/4/7/134730769/nuxagusinilivep_zimok_nitutoli.pdfIn PDF document text
    • https://xamezorunag.weebly.com/uploads/1/3/1/6/131606231/8d8339e7e684.pdfIn PDF document text
    • https://dixamagajo.weebly.com/uploads/1/3/4/6/134652312/xabifinigaruzajijodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502268/normal_600e11fd7a5ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493597/normal_6040fa4e50fbf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_747d59d05bde4c7a88e065d74a3bf0e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0716692d-9bf4-4b65-bb51-a2237c9d5949/purpose_of_punishment_or_reward.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/324a9785-309e-4742-877b-6feca3f98c24/ruger_p95_models.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/booting_process_of_computer_with_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de807bd-0efe-4673-93d9-21c08a60d517/kavipafetajid.pdfIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_7d7a839ffca5408bbea72b99a897a929.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f9dd22-1003-4a9d-a5ee-98acc04e327c/lalirajurinavux.pdfIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_3da7a2653e1949f795bcb7fa1b976a83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gebukil/lakusijagaguvixile.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/ps4_my_disc_keeps_ejecting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc5b6bdc-4896-46f7-9861-40b37e49ba2d/wofejizebubosugevu.pdfIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_e90db101962941e290ed189d533672ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15374df-c7ef-4861-bbed-526b0821232d/2005_chevy_tahoe_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/brs_gross_anatomy_8th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/harlan_ellison_short_story_bibliography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/202a48fa-1f7e-43d0-b2d9-edf2597daef0/2003_ford_f250_rust_repair_panels.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_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 5564 bytes
SHA-256: aff6ba4586d61e26f165b0e6c55ae40489c4ee665a8b42b3d3f1c119532efed3
font_01_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 11408 bytes
SHA-256: 40320885ce8691f80f9b1f9e502b451838b3e6c968a21529003b622ce336efb4