Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa3dd9754689eec…

MALICIOUS

PDF

75.6 KB Created: 2021-04-22 23:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5f8445b766e1f5383625fe1aea6d8475 SHA-1: 206dc46cd621c87d15444f8b4382b0975b4168a7 SHA-256: 6aa3dd9754689eecd49ad9cca765d8656d645f0a32d1f95c28b29c6a45168015
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a suspicious URL that appears to be part of a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded URLs and the PDF structure suggest an attempt to direct the user to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=navy+technique+to+fall+asleep+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424647/normal_601f5f24ca2f5.pdfIn PDF document text
    • http://kivolugog.mypressonline.com/artificial_intelligence_tutorialspoint_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_6014f870d7f09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493610/normal_605f993da2b9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495413/normal_605b6e3d6d063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495855/normal_605f4224cbc7d.pdfIn PDF document text
    • http://viwavidif.getenjoyment.net/vaikhanasa_agama.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369333/normal_5fcc8e8d1d217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497109/normal_604fc9661de64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e6d726d-7e56-4061-a578-709ec55013e2/element_32_smart_tv_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c3ee77-7230-4f4f-96d8-90443032eba3/63316423329.pdfIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_d6c951a98c544a45b803b0fe29b3c4b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a87531d-ec92-4c74-a404-3586dc709f2e/what_is_the_formula_for_finding_gravity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a995647-423e-4f69-826d-7318b6b28fb3/average_salary_of_machine_learning_engineer_in_dubai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a0b0d0-7139-4e92-bb32-c549d80d55c9/kenmore_vmw_shift_actuator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c5f9c6f-d8ba-4d6e-b177-f785e4d7a8d7/zitajufekifimuk.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_dfb662b73a7d4ab4bdd0358c49638fc7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/802d4e91-8802-40c4-96c3-b1f206a728fb/33877935480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51f75879-8ed8-4c1e-b1f9-07f0bd295814/why_is_the_water_cycle_so_important_to_life_on_earth.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_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 5500 bytes
SHA-256: 7f64fb59d2fe62555a2168869f41ee92a2401689c20a0cff0c7c7bfd1ec99aa1
font_01_sfnt_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 10188 bytes
SHA-256: 9d134d8e184e411c8932be71fb30e71687859ea39121d0b2c2ac3bee6f187cd6

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