Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f44e84741d038e9…

MALICIOUS

PDF

81.2 KB Created: 2021-03-20 08:46:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6e0c65d4544cda77d2a003da3f41bf8 SHA-1: 6a6889daa6296f6e798f67783d821d9ac67143b0 SHA-256: 3f44e84741d038e910fef144ea7d457d6b28f8c75bd1fcdd12117264da0678f8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to 'dafemum.ru', suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=how+much+does+fbi+swat+make
    • https://cdn-cms.f-static.net/uploads/4370089/normal_5fe798cb458c8.pdf
    • https://cdn-cms.f-static.net/uploads/4459469/normal_605506204b578.pdf
    • https://cdn-cms.f-static.net/uploads/4402280/normal_6045040862fb8.pdf
    • https://cdn-cms.f-static.net/uploads/4382965/normal_603698f1758e5.pdf
    • https://static.s123-cdn-static.com/uploads/4421781/normal_5fcc8be09d82d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/navoburarovada/89701068541.pdf
    • https://uploads.strikinglycdn.com/files/dba289ec-6108-4598-8d5d-79c2c35b4d53/tonom.pdf
    • https://s3.amazonaws.com/zifozujiwi/aptitude_questions_and_answers_for_freshers.pdf
    • https://uploads.strikinglycdn.com/files/f08539bf-72ec-41c3-be52-b89fe85a6cb3/kejunut.pdf
    • https://uploads.strikinglycdn.com/files/deb39ddc-162a-4f0a-909b-146d3f9dacb7/caa_act_bill_in_hindi.pdf
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_61dc4080246d4799834d6c34739beae0.pdf?index=true
    • https://s3.amazonaws.com/jeromopelurab/40532909040.pdf
    • https://uploads.strikinglycdn.com/files/0930b2dc-2d90-4088-98eb-4727c88ad452/revatosedem.pdf
    • https://uploads.strikinglycdn.com/files/a1762f2e-3673-4c11-96ca-a436e3fbb8e3/bissell_proheat_2x_revolution_deluxe_carpet_washer_review.pdf
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_ac047db416bd48d8ae66a78f7967b1cb.pdf?index=true
    • https://s3.amazonaws.com/jejulurowev/types_of_adjective_worksheet_for_grade_5.pdf
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_2436586c125241f5bb8565e4df2aff01.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f5352b13-94f7-4ca4-8578-5d097cca348e/reading_comprehension_worksheets_grade_4.pdf
    • https://s3.amazonaws.com/fenatagazise/25380517966.pdf
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_1f3db0cb868549d8843887a553ffee2f.pdf?index=true
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_d8cc7409e92647cbb2d7df647b13d364.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b077b9d4-53ab-4d1f-bbe9-3702e0f0e17e/are_sweet_potatoes_good_for_the_liver.pdf
    • https://uploads.strikinglycdn.com/files/898342bc-ed89-4f91-a2c2-baac5072bd37/2004_chevy_malibu_classic_battery_light.pdf
    • https://uploads.strikinglycdn.com/files/c80267b6-16f6-4e65-84d2-db23cef7a344/does_investor_or_management_sims_4.pdf
    • https://s3.amazonaws.com/garorowa/tukipunarunolibek.pdf
    • https://s3.amazonaws.com/vuzotisenixava/breuil_cervinia_ski_map.pdf
    • https://uploads.strikinglycdn.com/files/c84e2d34-e83b-4d45-891d-6db16a984c92/92229397708.pdf
    • https://s3.amazonaws.com/tobaziw/motuwopoxaxalalifu.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_off0000ff33.bin
9d09eb4579214a4d3cdcb06e19a686b4c3822f3e531087729554ad138351f6ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 5392 bytes
font_01_sfnt_off00011175.bin
74fa0d1e1420b40a85c9a7b0ea64c475288ab790c2837a39f87e02f94161a88a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11175 10880 bytes

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