Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a9ff106923f683…

MALICIOUS

PDF

85.4 KB Created: 2021-03-18 15:00:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfb927ea5ea4df58a6335155c63c7f3b SHA-1: ddd13958bfc8b641d4346f6713ba36a00d23aec0 SHA-256: b3a9ff106923f6837a891cd480c4544cc88bfbe3373f3026ceaca2fa89984678
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'nipisod.ru', which is likely used to host malicious content or redirect users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the malicious URL and the detection signature strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://nipisod.ru/wix?keyword=chakra+natures+ranked
    • https://cdn.sqhk.co/zadoweferoxe/Lbicnhb/leniv.pdf
    • https://cdn-cms.f-static.net/uploads/4427544/normal_601f7eb463846.pdf
    • http://copyrightsupporthelpcenter.com/how_much_do_air_conditioning_technicians_makeldgyt.pdf
    • http://axecheat1.xyz/80104207444wqbzd.pdf
    • https://cdn.sqhk.co/xaselavub/fhGSvbc/weather_forecast_transparent_clock_widget.pdf
    • http://opssmall.space/rafojigilixiwudw2usj.pdf
    • https://cdn-cms.f-static.net/uploads/4468289/normal_5fd839e2b5bfe.pdf
    • http://linza.media/mijebutawixewurzzqe5.pdf
    • http://veduxaze.iblogger.org/the_benny_hill_show_theme_song.pdf
    • http://republvinb.fun/kumubijepunigiljr1vk.pdf
    • http://ronebiwoti.22web.org/70643484569.pdf
    • https://cdn.sqhk.co/wimiwupo/jgfdIje/82662493784.pdf
    • https://cdn-cms.f-static.net/uploads/4408864/normal_603d7d534a92c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fuvidokibet/rulafuxewekisurunoj.pdf
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_32a567f58c0b483ea441e0eb2945fc5f.pdf?index=true
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_61cd332cadd5458ca241b94961c2288a.pdf?index=true
    • https://s3.amazonaws.com/fuwenoxuzasila/constipation_guidelines_australia.pdf
    • https://s3.amazonaws.com/wizedumi/ethiopian_music_album_free.pdf
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_1c340ebfdfe34cfaa0f2c96eae7460f2.pdf?index=true
    • https://s3.amazonaws.com/kubafezin/9132144453.pdf
    • https://s3.amazonaws.com/ragejufa/58733081185.pdf
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_11653405936042699e6d76d19320d099.pdf?index=true
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_d52ac3d728f44223b4ef435a812e7834.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbd8.bin
5c4ab51fda16a9ce3c8308d3551c3207ed9558bd83b5979a8add28c86d1215f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 4848 bytes
font_01_sfnt_off00010c46.bin
4b8eb3d544d7599320e7bf59e7c71882616597cdefc07d5ffb4e509b070e1596		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C46 11196 bytes
font_02_sfnt_off00013194.bin
3afbc95f4a2677bf4c8b77bd7df62e4dbeb651db4b5e482cf97b58e472170d58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 16164 bytes

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