Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf606d668c6b461…

MALICIOUS

PDF

128.5 KB Created: 2021-03-29 08:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ccc113011ff679ac9781eeb6a871b74 SHA-1: e5a93b04645f7d0b26c8a095d81e9045405520b5 SHA-256: abf606d668c6b461b475db1611f5e7708f9d7b2ef5be8e8fdf57892282002ee1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection mechanism to host malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=westminster+shorter+catechism+question+37
    • https://cdn-cms.f-static.net/uploads/4464734/normal_600ce210a983b.pdf
    • http://tumbochka.space/tom_clancys_rainbow_six_siege_trailer_ps433v5v.pdf
    • https://cdn.sqhk.co/nejijilo/jGHjjjf/65160688966.pdf
    • https://cdn.sqhk.co/noxisoture/Ojhjjis/hangouts_application_for_windows.pdf
    • http://accface.in/tazivenakapapixixau4jm5.pdf
    • https://cdn-cms.f-static.net/uploads/4406789/normal_603aa27312568.pdf
    • https://cdn.sqhk.co/fovomesit/jfGFhhm/62770631138.pdf
    • https://cdn.sqhk.co/segexiji/ifgg6TM/dasobim.pdf
    • http://vermono.site/63875213406ajgwh.pdf
    • https://cdn.sqhk.co/xojugako/jijhijU/58868727900.pdf
    • https://static.s123-cdn-static.com/uploads/4497646/normal_5fd067a3b032f.pdf
    • https://cdn.sqhk.co/wirumedaba/hVRjb5V/56368485199.pdf
    • https://cdn-cms.f-static.net/uploads/4382962/normal_6016c60b1a69b.pdf
    • https://static.s123-cdn-static.com/uploads/4416332/normal_5fff3207150dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4c38db24-2924-4bf2-81c9-04860d987a69.filesusr.com/ugd/a68d8f_92abda42d50f477c84800af85a46a323.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a4af0975-00fd-4aee-8924-515f15e70abc/plantronics_c054_battery_light_flashing_green.pdf
    • https://uploads.strikinglycdn.com/files/8b408576-6bb4-4e65-83a0-e126a4ca6e18/65951280742.pdf
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_6f6fe2cec6b144beb29b666e1c89e0cc.pdf?index=true
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_45bad552886741c8b1f1f16e425d3db2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f35a2740-18df-47a4-97d4-0f5ea813bc5c/what_is_the_meaning_of_history_of_economic_thought.pdf
    • https://uploads.strikinglycdn.com/files/6da018ff-270c-45a0-8d86-b58878d4acc9/84296564790.pdf
    • https://uploads.strikinglycdn.com/files/4bc8b86a-6933-4e62-9dc6-c1fb34b3a9dc/59918257398.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_off0001b809.bin
3e6611b55461de1f01a46d4c1d124184629a4518eb24f7b0e820989b953c0ac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B809 5388 bytes
font_01_sfnt_off0001ca48.bin
5f741907e7a0304f524efc45f89c0bba50a37e1e77e1f813283428015e9f7f9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA48 11616 bytes

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