Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbdf70293327c78…

MALICIOUS

PDF

85.9 KB Created: 2021-03-18 12:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8dc97e508ab6e52e9b89a0ad49f492fb SHA-1: e16fcda24ce7efb0b79181ce3bc213c8696e73b8 SHA-256: 8fbdf70293327c785bf5ac5c2b303ced12eafd96fafc5e7ba7a6d18a968a1e02
216 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. The presence of a 'macro/content-enable lure' and 'password-protected archive lure' heuristics indicates the document is designed to trick the user into enabling content or providing a password to access further malicious stages. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://nipisod.ru/123?utm_term=agonist+and+antagonist+drugs+pdf
    • https://cdn.sqhk.co/tanusulirava/e5qihjg/3499206363.pdf
    • http://jezolixepoj.22web.org/a_room_with_a_view_full_text.pdf
    • http://wedejopejujotu.iblogger.org/basara_2_heroes_dolphin_emulator.pdf
    • https://cdn.sqhk.co/pugirunosamo/aLjgjdv/7774813144.pdf
    • https://cdn.sqhk.co/tawavumazo/hbgigjj/getabedugopolenexoj.pdf
    • https://cdn.sqhk.co/vopuvafamiw/7gcYggJ/history_of_medieval_music.pdf
    • https://cdn.sqhk.co/patizuruf/fjghgje/sirezevutobobuludumitanop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_db7ff0b81f64461ba56a2ce3f90b904d.pdf?index=true
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_366bffb7c2824c019e546e82574d07bf.pdf?index=true
    • https://s3.amazonaws.com/wazotojemov/83570938855.pdf
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_0489911c4c654e2dac504a4d41a224c9.pdf?index=true
    • https://s3.amazonaws.com/fulosobezur/42814615605.pdf
    • https://s3.amazonaws.com/fezenur/20013741556.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/96356851749.pdf
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_46aef778c0634b01a2e24e3f6f30878c.pdf?index=true
    • https://s3.amazonaws.com/pogolo/2006_honda_civic_hybrid_brake_problems.pdf
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_dfef380491a8461b8a20d121665edf36.pdf?index=true
    • https://s3.amazonaws.com/fivebo/city_of_thieves_movie.pdf
    • https://s3.amazonaws.com/godoremitiwuja/ashrae_psychrometric_analysis_cd.pdf
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_35360dfc33794437985c943d208a07cc.pdf?index=true
    • https://s3.amazonaws.com/wexukufedepim/media_agency_company_profile.pdf
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_d695df963fff4c54af7289a90dbf76e0.pdf?index=true
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_1e1e7c96087e4d96af0f74db9ea75f8c.pdf?index=true
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_27455b81afba4ea68c8e1ddc5c6f2647.pdf?index=true
    • 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_off00010fda.bin
13f764c6440ff783787bb61e6f8db4f6722f248db082299c097f07b8523bd797		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 5164 bytes
font_01_sfnt_off0001217d.bin
0e2ddb819ae31c5fc323d41c48892fe4831b77c0fdb93d9cc9229e802553d8de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1217D 11996 bytes

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