Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5035ab538bb822…

MALICIOUS

PDF

70.6 KB Created: 2021-03-11 02:10:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12dbee14dec50a8a4fac4fe711e57cb7 SHA-1: 3e914cfa56020e370745bcf070b4b207256c0a60 SHA-256: ef5035ab538bb822a3059f2ee8e619b0c1d480befed378702fe83f8d3395ec59
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm heuristic firing, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to exploit users.

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://lozipotod.ru/wix?keyword=whack+your+ex+game+center
    • http://hookup153.space/xomalagomezefelafalefeoyeim.pdf
    • http://ital-girl.space/murray_snowblower_auger_belt_replacementyxv11.pdf
    • http://ribupisid.22web.org/gopijuzaguto.pdf
    • https://cdn.sqhk.co/dodalowogiv/gNjhKhb/age_of_ai_war_strategy_apk.pdf
    • https://cdn.sqhk.co/sativomofij/R5jfQnN/ww2_bomber_games_unblocked.pdf
    • http://zipipenele.22web.org/solving_system_of_linear_inequalities_in_two_variables_worksheet.pdf
    • http://sdorovie-sustavi.xyz/bike_jump_ramp8xjas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6897d0fb-ced5-4019-a24e-b56e0547e35c/secrets_of_closing_the_sale_summary.pdf
    • http://miwusox.rf.gd/1233435250.pdf
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_d6052c57bc4f4f6ea2aca94481cf3988.pdf?index=true
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_62db9d30fd8d48d58323033a3abb213c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cbf0ba84-3867-4a9f-88ee-d295db552a38/ez_go_golf_cart_transmission_problems.pdf
    • http://boganarupimuga.epizy.com/zavotanedisitozuxarowi.pdf
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_ba06b71a739e4b47aed59a8f5582276d.pdf?index=true
    • http://likijanima.epizy.com/lagu_arvindo_simatupang_panolsolion.pdf
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_bb6d285faaac44fa85c666fbd75d86c4.pdf?index=true
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_f2a27cda54054cfe82f812f52cc75eae.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c69626de-ca6a-4895-9b73-43df0a71e997/26965540576.pdf
    • https://uploads.strikinglycdn.com/files/8750c00d-9378-42ba-9ab2-7c54751ac814/nufatotuvipela.pdf
    • https://uploads.strikinglycdn.com/files/2dd9e8f7-5f73-4a8c-8271-f6f15b27d659/wudebitakurezotuzineti.pdf
    • https://uploads.strikinglycdn.com/files/99fc0770-6d36-4531-8c5f-7e09ed0ea703/how_to_convert_text_to_on_iphone.pdf
    • https://uploads.strikinglycdn.com/files/81ec9933-745c-45c0-930b-758c25c9d476/what_does_the_tip_of_the_iceberg_mean.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_off0000d757.bin
7d9b8878aa9e9aa3ada65804506b07c595df0a6872674ee516c7002ca550eb8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD757 5248 bytes
font_01_sfnt_off0000e921.bin
c5f0833d33f0ade91e5a21a8131e96b34e6908e5bb55e64a9de19989be22ac34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 10956 bytes

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