Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a4ef24c7fae910…

MALICIOUS

PDF

77.0 KB Created: 2021-03-30 18:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dda33b2ff075d39f0efdcc44474c1198 SHA-1: 50f8874d30b20e2e4aa27badd32bb1bdfd892b05 SHA-256: a8a4ef24c7fae9100a4c8f52ad8d8b7d2628803f560d66a2a73c5378f2cd8008
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains an embedded URI pointing to a suspicious domain, likely for phishing purposes. While no scripts were explicitly extracted, the presence of embedded URIs and the ClamAV detection suggest a phishing or malware distribution attempt, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=tao+tao+110cc+atv+for+sale
    • http://20970907.net/holiday_cocktail_party_invitation_template0d3n2.pdf
    • http://bestcreditcheck.info/project_management_book_of_knowledge_6th_edition8ewik.pdf
    • https://static.s123-cdn-static.com/uploads/4458854/normal_5ff84d54792ba.pdf
    • https://cdn-cms.f-static.net/uploads/4412592/normal_6020d406e5ce2.pdf
    • https://static.s123-cdn-static.com/uploads/4414166/normal_5fe216e5b2b36.pdf
    • https://static.s123-cdn-static.com/uploads/4427820/normal_5feb5c687ae79.pdf
    • http://laitlabs.pro/16536469613yho6i.pdf
    • https://cdn-cms.f-static.net/uploads/4485693/normal_6036822259ef5.pdf
    • https://cdn-cms.f-static.net/uploads/4417535/normal_605203255d313.pdf
    • https://cdn-cms.f-static.net/uploads/4375528/normal_60435c1bea36f.pdf
    • http://gagarinski.su/what_are_the_13_days_of_mourning_in_hinduism261ng.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vonuxagupeduze/dijunife.pdf
    • https://uploads.strikinglycdn.com/files/33ffd621-9ad6-4e82-b33d-94ecaa6588c8/how_to_get_your_fire_stick_remote_control_to_work.pdf
    • https://uploads.strikinglycdn.com/files/3349b1d7-4281-4050-a9ee-aab3a96e48b5/34175877010.pdf
    • https://s3.amazonaws.com/sedowedi/ropux.pdf
    • https://uploads.strikinglycdn.com/files/7a93627e-90f1-4362-8581-2a35eae2209a/begexewaxubi.pdf
    • https://uploads.strikinglycdn.com/files/a594e655-4b2c-4fe4-8554-ddf67ed5760a/dixiduvosibapidomunabu.pdf
    • https://s3.amazonaws.com/forupokisip/bedewalulotapugekafoju.pdf
    • https://uploads.strikinglycdn.com/files/af1a388f-17af-4246-b61e-2f8fcd05d17c/varig.pdf
    • https://uploads.strikinglycdn.com/files/f3fd2b1c-669e-4258-9d16-438fcc64f873/old_navy_maternity_return_policy.pdf
    • https://uploads.strikinglycdn.com/files/807b647a-7406-4b2e-953a-ae5d4caae9f8/56524363343.pdf
    • https://uploads.strikinglycdn.com/files/e47e4c17-e470-44d1-a3d2-8f22f5d23098/charlie_and_the_chocolate_factory_book_summary_in_100_words.pdf
    • https://s3.amazonaws.com/figidireki/violin_f_hole_template.pdf
    • https://uploads.strikinglycdn.com/files/c87544ef-c65b-46cc-94ac-b3a547b68fee/turnigy_accucel_6_input_voltage_error.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7b.bin
46bdd72eec88e1e1adb556ccf3448cb0eafe49e0dbdd11535a83740a6a67ff17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 5076 bytes
font_01_sfnt_off0000fedc.bin
8d346b43a6f2c28d8094fcf930d65fa4c81486a820634f74fe2a070f089781d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 11180 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.