Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d8e2f88491867c…

MALICIOUS

PDF

116.5 KB Created: 2021-05-04 02:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8485169086d5c9c7bc35476f24b102a SHA-1: 727f8d18d8e8828621e5f5fa31206a0de66e32d4 SHA-256: 83d8e2f88491867c4c8cb8ab092ed523b782f5795c0dec701ac20dd71f98cefa
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL pointing to a suspicious domain, identified by heuristics as an external URI and an embedded URL. ClamAV detection and ML classification strongly indicate maliciousness, specifically a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URLs implies an attempt to redirect the user to a malicious site for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=blue+bossa+joe+henderson+solo+transcription
    • https://cdn.sqhk.co/dikonutudibe/gijzqgi/windows_10_april_update_manually.pdf
    • http://titalat.iblogger.org/boladun.pdf
    • http://findssldz.xyz/29979942438lbsl4.pdf
    • https://wefikugozakilo.weebly.com/uploads/1/3/1/0/131069992/e6b030af86f73.pdf
    • http://abistrans.ru/how_to_connect_2_dj_mixers_togethercae1v.pdf
    • http://busurman.space/54770183788a785y.pdf
    • https://cdn.sqhk.co/tijatabov/clihhJx/depazabewipuxalinadowogoz.pdf
    • https://static.s123-cdn-static.com/uploads/4411917/normal_5fed5810cff88.pdf
    • https://pozuxopukemo.weebly.com/uploads/1/3/4/7/134705319/76981be53409.pdf
    • https://cdn-cms.f-static.net/uploads/4426087/normal_603355d98db2d.pdf
    • https://cdn-cms.f-static.net/uploads/4417658/normal_6046557468751.pdf
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/laxusewav_fubep.pdf
    • http://gogadozuxigode.iblogger.org/ihra_rulebook.pdf
    • https://cdn.sqhk.co/sepufaziru/ndjmhb8/wallpaper_steam_punkin_themes.pdf
    • https://nodaveto.weebly.com/uploads/1/3/4/2/134266094/90172728a50af4.pdf
    • https://rimofemosi.weebly.com/uploads/1/3/4/3/134351632/debodewegi.pdf
    • http://feldhaus-klinker-plitka.ru/used_nikon_sb_800_speedlight_flashw5108.pdf
    • https://cdn.sqhk.co/ponigubik/ibamQjf/18818836895.pdf
    • http://sidivupexelado.22web.org/arteritis_de_takayasu_pediatria.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jalasofumikom.rf.gd/chiang_mai_tourist_map.pdf
    • https://s3.amazonaws.com/fopalew/how_to_become_it_auditor_certified.pdf
    • https://s3.amazonaws.com/wejuvono/cue_sheet_file_format.pdf
    • https://s3.amazonaws.com/tugumeb/59519045743.pdf
    • https://s3.amazonaws.com/rurosaveruk/body_corporate_levy_clearance_certificate_template.pdf
    • https://s3.amazonaws.com/pigolo/sedatoxerakotamusu.pdf
    • http://sabaramofedofi.rf.gd/calendario_lunar_cannabico_2020.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
    • 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_off00017750.bin
87b14dee664bff3262560f699a4e6fc469f855a07aa99698444e9f3b7074bddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17750 5428 bytes
font_01_sfnt_off000189b6.bin
f0f13f05e471eb509ad2a86c5287d16bbe58fb36581bdc654ba12ab9e2a728dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x189B6 10688 bytes
font_02_sfnt_off0001ae56.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE56 16204 bytes

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