Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc85df264915fdaa…

MALICIOUS

PDF

70.6 KB Created: 2021-03-16 05:13:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f978ae49d9379b3bcdc4a2d6a21a842d SHA-1: f16fca57c5cdda63e0f4aba8b771e11148f6e2c5 SHA-256: fc85df264915fdaa17176e6d17c9848f69052b9cb91f6f07c5aad59fe3fe8380
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spamming operation. One of the extracted URLs is https://bologen.ru/award?keyword=buccinator+mechanism+pdf, which is likely part of the lure. The document body is heavily obfuscated and contains no readable text, but the presence of numerous external links indicates a redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/award?keyword=buccinator+mechanism+pdf PDF link annotation
    • http://saroforati.medianewsonline.com/83254160764.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/serenutitalodelirotofamuv.pdfIn PDF document text
    • http://tepoparupomo.medianewsonline.com/23737251385.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/human_resource_management_calicut_university.pdfIn PDF document text
    • http://sakivometo.medianewsonline.com/surigepitemabupa.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/crp_blood_test_detect_cancer.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/5e36cd30-8e9c-42eb-800b-f8564e73aef9/37850173501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dea3b90-fef8-4d0a-8b12-4aa1908c4566/free_crochet_patterns_for_super_chunky_yarn.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/baloba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1e57426-c4fc-4ca8-8f96-cfa41a179480/timex_heart_rate_monitor_watch_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/939908d5-1eeb-47d8-83f2-ab21ec4c21e5/nofutuwinawowuvutujogezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ba2700-b114-4868-8db7-880a3ca4b5b4/96100859929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c04b23e9-99b0-4b68-a725-01b7cbb8c166/11896835146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9047abf-36d1-423f-8b80-b058890fb998/how_to_find_the_value_of_n_in_a_triangle.pdfIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_9499d1cbdcac4c4aa65c20c05b7832cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/6073426170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a90240-5a56-4d94-ad7e-0eb36658580c/vupuwe.pdfIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_4f8dee6ad7e747a980b2e26f7326c5e2.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_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 5412 bytes
SHA-256: 8d8421c98b991e464b791d8a4676ad89355af42b9cc9fddeaea54081d5c29ac2
font_01_sfnt_off0000ea03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 10244 bytes
SHA-256: 8609f0e5449a00dc89a0e6e002833d03c9a87d4df638e879e8e76a67b81721a4

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