Malicious PDF — malware analysis report

Static analysis result for SHA-256 898796b4f3f3c7c5…

MALICIOUS

PDF

79.7 KB Created: 2021-03-28 06:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07279583c29bec3d9b535005b7579c82 SHA-1: bb8d67ae947932ea937daa5744053b6a9506c64e SHA-256: 898796b4f3f3c7c581052b09f9d8041d1cad30df5041f39fa78ebaf725dc1b02
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to manipulate search engine results. The embedded URL 'https://midufefew.ru/award?keyword=anatomy+and+physiology+book+online+pdf' suggests a phishing or scam attempt, masquerading as a search result to trick users into visiting a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://midufefew.ru/award?keyword=anatomy+and+physiology+book+online+pdf
    • https://static.s123-cdn-static.com/uploads/4388063/normal_5fc9ba677df1f.pdf
    • https://cdn.sqhk.co/repipedifavi/hbJlJif/jorifuw.pdf
    • https://cdn.sqhk.co/kikutajaz/iaNDXic/nekat.pdf
    • http://figupatofewox.iblogger.org/catalogue_ikea_maroc_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4455178/normal_600b3ae0cf14d.pdf
    • https://cdn-cms.f-static.net/uploads/4367627/normal_603edba9ee30b.pdf
    • https://cdn.sqhk.co/sogupavetut/jcijjjb/build_battle_minecraft_map.pdf
    • https://cdn-cms.f-static.net/uploads/4494166/normal_60195d2a369de.pdf
    • https://cdn.sqhk.co/zodunoxurob/aeQhjvI/disordered_definition_adjective.pdf
    • https://cdn.sqhk.co/loberutebe/fidd1Ft/new_york_city_rent_guidelines_board_increases.pdf
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdf
    • https://cdn-cms.f-static.net/uploads/4426409/normal_6048a02a7207c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_04349f2bcb6545a29f5bff1db29490a5.pdf?index=true
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_00491bf96d0d48e192477b66f74798c4.pdf?index=true
    • https://s3.amazonaws.com/lososimap/65100290064.pdf
    • https://s3.amazonaws.com/zijivevip/23431147628.pdf
    • https://s3.amazonaws.com/rudelazifizuvo/beamng_drive_full_game_pc.pdf
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_daa9f795343d4e4fabe13277cabaa331.pdf?index=true
    • https://s3.amazonaws.com/kozewuposoridil/97123242594.pdf
    • http://bapinusajix.rf.gd/coliform_bacteria_count.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_off0000ebae.bin
9bf5f5813c978da9f7008540c458c04abcda48e4a6fb64fb01e2e179f856843d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 5444 bytes
font_01_sfnt_off0000fe0c.bin
47c46f119e4e0817111640af1eef7b5ad5ff3a2214de990e702f337a133a4a8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0C 10812 bytes
font_02_sfnt_off000122c4.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122C4 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.