Malicious PDF — malware analysis report

Static analysis result for SHA-256 6314c7d1466794d4…

MALICIOUS

PDF

78.4 KB Created: 2021-05-17 10:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: dad8b1e2f9f2c5af58348d7efb40ee33 SHA-1: d8e9ee0f69b852344b4e659d9dd624d4cb1bbcec SHA-256: 6314c7d1466794d4b81cb279810c987bf21a124f61b1980799fe54315ab204df
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://zajinet.ru/strik?utm_term=average+salary+of+compliance+specialist PDF link annotation
    • https://cdn.sqhk.co/sopiloroda/RfWjcds/construction_company_simulator_build_a_business_mod_apk.pdfIn PDF document text
    • https://suduvigil.weebly.com/uploads/1/3/4/6/134697429/dabisaxi.pdfIn PDF document text
    • https://vemisalisak.weebly.com/uploads/1/3/1/4/131437925/2723281.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/8NRsXEt/diamonds_of_sierra_leone_bpm.pdfIn PDF document text
    • https://gonudelosake.weebly.com/uploads/1/3/4/7/134750135/fudakasujada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_17ab6c83beb74ceda034a3fd37169897.pdf?index=trueIn PDF document text
    • http://jenuvuzawo.epizy.com/lazawibes.pdfIn PDF document text
    • http://jarebavax.epizy.com/arduino_filetype.pdfIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_9bf0b1500b174e1e855e4c22650bab89.pdf?index=trueIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_0c31a7a3d6b042289ad81d74ca88e6d4.pdf?index=trueIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_ccc30285c7fe4a03a8193628f539f6fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5f0e440-9a2c-4032-ae5b-1ccd5d1fa4a9/investment_banking_for_dummies_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be40058-c569-4851-a135-00a1b25f4f5f/39682141502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a14ea9d2-c7af-4a8d-8818-d44927213e33/33477264056.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_dcefe5c21df842be85ff224cd0ffb6e0.pdf?index=trueIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_21bbef96d02549409c1b9080032b39db.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 5272 bytes
SHA-256: f7807bb9c7727ca321df68cbf4b6115d71ef918ae34d99ac0ff07cd55765e3cb
font_01_sfnt_off0000fa39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 10600 bytes
SHA-256: dee6c6757b8390aeed852934eacfe3900c1709538a2d2b4b8e8aae6ca9a0442e
font_02_sfnt_off00011e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E88 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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