Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9f315b94d27810…

MALICIOUS

PDF

71.9 KB Created: 2021-03-04 15:11:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c839f3ee5be8a806319eaaa83a90aa95 SHA-1: 4e202f50071eea17a7566e01736b3df7d57431f6 SHA-256: 4a9f315b94d278104f87f93377d0df5606d56693c6fba2e63d1234ade88e693f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is also identified as a link farm on disposable hosting. The document body, though heavily obfuscated, suggests it is intended to direct users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://vilenefex.ru/wix?keyword=sort+the+court+scientist PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380226/normal_60233214256e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427273/normal_601faa8445577.pdfIn PDF document text
    • https://kusejibetejoxer.weebly.com/uploads/1/3/4/7/134749151/0524448.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/4435968.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_573492496e3346339d0c48dcf7cfd0b2.pdf?index=trueIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_5ad177d520494d6eaa3220b91a1b2d4a.pdf?index=trueIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_8d7f8c30dfcd49249f8ef72078733198.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1224dbe-031c-488d-b5dd-a6b98ff8196c/49798249364.pdfIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_2acfa1f2e1d2417c8ca8776857f50038.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sepawi/87748473677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b65398-202c-4233-87c4-6468d0f0ae98/wukabajoloz.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/the_witcher_book_set_paperback.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/door_hinge_routing_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba58ac7e-75b6-41c3-a094-bd7a18240b3f/how_to_use_panasonic_lumix_g85_as_webcam.pdfIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_3f15267e90814ec88d0e79fec79729e8.pdf?index=trueIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_ed24109932724adc89ec9ca1938e3edb.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 4748 bytes
SHA-256: 71f6a3dcd36c4e9f3265c84bdcd043c1b9021acd15fc1ca7b86692c750c32e32
font_01_sfnt_off0000ee1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 10712 bytes
SHA-256: 820d5406ed358797ad5853758b75d162fbedb7076d8b2a75419a22988aa587f7

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