Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9707805fb782fb…

MALICIOUS

PDF

73.7 KB Created: 2020-11-18 08:12:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a2682c00cea508dcb9ca54fed229573 SHA-1: 1cf17131e13d11611d020567bab0db0879366780 SHA-256: 5a9707805fb782fb145ab6451a0b7274ac5913a4b54c13a6125bcd63ff88664d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggests an attempt to direct users to potentially malicious websites. The document body contains garbled text, indicating it is not intended for direct user consumption but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/strik?utm_term=husqvarna+chainsaw+disassembly
    • https://wuwawibef.weebly.com/uploads/1/3/4/6/134608234/zoboleke.pdf
    • https://cdn-cms.f-static.net/uploads/4393485/normal_5fa743bd8a85d.pdf
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/6773697.pdf
    • https://cdn-cms.f-static.net/uploads/4388271/normal_5fa843846f974.pdf
    • https://cdn-cms.f-static.net/uploads/4458849/normal_5fa5ece8244ef.pdf
    • https://cdn-cms.f-static.net/uploads/4390684/normal_5fa9fd6754273.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2a0a4292-81d1-42ee-a644-954a077f8542/sabatasso_s_gluten_free_pizza.pdf
    • https://uploads.strikinglycdn.com/files/78f2ddca-56a6-4c3c-95cb-85fcccdc4240/92674083673.pdf
    • https://uploads.strikinglycdn.com/files/27833daa-a1d1-434e-b9f5-f51e0a917819/rld.dll_sims_4_trojan.pdf
    • https://uploads.strikinglycdn.com/files/8843a3e1-42e3-48d1-a4ce-8233b2b7de55/rancor_giga_pet.pdf
    • https://uploads.strikinglycdn.com/files/2adaa985-738e-45e0-883c-4ba544a42cfe/welding_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/deb6b493-6bf4-4df8-9f3b-70436b1d0836/lotasetizimurubasubuv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d405.bin
6f5cd9b5a2037349a6ef48b93d74b84c74d6e5a70df6abf6383319f078e0cdc2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD405 5352 bytes
font_01_sfnt_off0000e603.bin
1963d8cc8cdce731aa03b133f6db82eeb92383f6796809f16d1401d68599fac1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 11128 bytes
font_02_sfnt_off00010bcb.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 4324 bytes