Malicious PDF — malware analysis report

Static analysis result for SHA-256 654e314fb8f673c4…

MALICIOUS

PDF

70.4 KB Created: 2021-04-28 18:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5107bbbfc870c2699aa92ff96c36a440 SHA-1: 644b0e7b3f3da2e20022bc9a684d9e0d336050e5 SHA-256: 654e314fb8f673c418c7998f48469709a4bc3e60c21d8e20e161a0617161e7b7
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs suggest a tactic to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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://botokaw.ru/strik?utm_term=dungeons+%2526+dragons+core+rulebook+monster+manual
    • http://help-verifiedbadgecenter.com/161042163ggswp.pdf
    • https://cdn-cms.f-static.net/uploads/4393363/normal_6049947c6299f.pdf
    • http://rezisekuvaz.mypressonline.com/what_is_a_warranty_deed_used_for.pdf
    • http://xeniveperovabef.sportsontheweb.net/kuvekigapebesopaji.pdf
    • http://pochta-24.cc/319345812008x046.pdf
    • http://yogist.fun/tripadvisor_bungle_bungle_guided_toursqwht2.pdf
    • https://cdn-cms.f-static.net/uploads/4391302/normal_605382e614a99.pdf
    • https://static.s123-cdn-static.com/uploads/4365601/normal_5ffca02402aee.pdf
    • https://cdn-cms.f-static.net/uploads/4495034/normal_603c469267c38.pdf
    • http://devgame.design/was_there_really_a_disappointments_roomm718n.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a17465c4-63e4-4036-9b1d-2f41eb8ac87f/46398769084.pdf
    • https://uploads.strikinglycdn.com/files/51d44b24-5db7-4ae3-908d-af4c85bf3339/love_monster_valentine_craft.pdf
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_eb528d5186ce47d0aca2b9a5465d726e.pdf?index=true
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_e60eba3d63e946b89fe392349ef808bd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e37bf0e6-0e9b-46de-a7ac-5adc33981f4c/junot_diaz_this_is_how_you_lose_her_quotes.pdf
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_0f152f82d77040478e8359484b7b943d.pdf?index=true
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_2fa0c266ed6b498e9dfe7d9b6485f95e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/75108527-2e7d-460a-808b-bf7863820c30/que_tipos_de_fichas_tecnicas_existen.pdf
    • https://uploads.strikinglycdn.com/files/8649902c-3bdc-46d6-acdd-04613c6432ad/segojefebaretiwoju.pdf
    • https://uploads.strikinglycdn.com/files/e0d80d72-1b33-402d-b083-368b68c36fff/can_i_connect_logitech_keyboard_without_receiver.pdf
    • https://uploads.strikinglycdn.com/files/b70d3eff-a6be-46d2-a5d7-57b699041279/futela.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_off0000d5a2.bin
dd8dfa4e14f29dc0aef559e633353ac704235c08d00e39406b7b55013d7d8930		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 4508 bytes
font_01_sfnt_off0000e513.bin
5f9dbabb30a7ddc9c6cf80e0258f29cac5c0ba7d1df66555055cbb6757497a3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 12084 bytes

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