Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f7b155d6927345…

MALICIOUS

PDF

89.9 KB Created: 2021-04-02 22:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 878111a8569a3b1df9f172e8b08f5c7d SHA-1: 81872e64a249befe554ce43570c04f09edb2ccdf SHA-256: b5f7b155d6927345460b5573dcf47b200735462b6c2e3e998782147dbd0931a4
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 high likelihood of malicious intent. The document contains numerous external links, with the primary one being 'https://zajinet.ru/wix?keyword=tantric+sex+pdf+drive', suggesting a link farm or SEO spam tactic to direct users to potentially harmful sites. The presence of embedded URLs and the overall structure point towards a phishing or malicious redirection attempt.

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-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://zajinet.ru/wix?keyword=tantric+sex+pdf+drive
    • https://cdn.sqhk.co/molodomo/ir4ja1K/download_game_ninja_dash_mod.pdf
    • https://cdn.sqhk.co/fiporalisu/jZgijca/1886323990.pdf
    • http://vezadawebowa.iblogger.org/pozut.pdf
    • https://cdn.sqhk.co/kugefiruxat/Qhagckq/40241963217.pdf
    • http://nukowivoxom.iblogger.org/angular_zip_file_from_server.pdf
    • https://cdn.sqhk.co/xavipinav/hfgfQie/mobile_phone_ringtone_audio.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_b8ae7e03ae3f4ccd9dcbcce2c8db254e.pdf?index=true
    • https://s3.amazonaws.com/roxawo/old_school_runescape_goldsmith_gauntlets.pdf
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_464bbfa486744236b65ca991331e6ea6.pdf?index=true
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_9277d21cf25946578d9339db52a39b1f.pdf?index=true
    • http://jolavewavesuj.epizy.com/sagevisetokikixemebi.pdf
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_37e6f6890ebc46a8a364170d8f97448a.pdf?index=true
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_1d4247888f604125b11e6b8e1d862fd2.pdf?index=true
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_1c2878e4282a41dea3a9a66a1f8869fb.pdf?index=true
    • https://s3.amazonaws.com/geraromu/dojojuvulogusoxefu.pdf
    • https://s3.amazonaws.com/lakadutof/sudubiwuz.pdf
    • https://s3.amazonaws.com/xalexojaxipud/michael_pearl_to_train_up_a_child.pdf
    • http://soriwolawiri.epizy.com/33557098282.pdf
    • http://rixasidaz.epizy.com/bagakinugasegexomabimor.pdf
    • https://s3.amazonaws.com/pusixa/watch_bbc_pride_and_prejudice_episode_1_online_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115d1.bin
b46a13dcb97fde3b92f66dfb364838c05ae69d99916a307b56a86ec407aaae5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 5192 bytes
font_01_sfnt_off00012795.bin
cb2eee6b3f734c25b0529266f0310981727f2430b6e2497e7681c4c329742e7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 12488 bytes
font_02_sfnt_off00014f6c.bin
c6c110edb8374310e0618d9a3c2725ff65fede7fbea0660e698f51aa06bfb856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6C 2752 bytes

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