Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1420c1c772f0128…

MALICIOUS

PDF

78.2 KB Created: 2021-03-09 18:06:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8b49e779186ceaad2b5f8c4e19f8753 SHA-1: 261b36249beec1cbf687310ad0488adf8dcd08b8 SHA-256: b1420c1c772f012809c69ae91cae3cc9569c3e63eb0eeba6df01a9f092e9a870
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to distribute malicious content. One prominent URL, 'https://midufefew.ru/123?utm_term=arcgis+10.+1++full+crack', suggests a lure for cracked software. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=arcgis+10.+1++full+crack
    • https://cdn.sqhk.co/leporolino/PSSaibc/juremaka.pdf
    • https://cdn.sqhk.co/mepapogivoma/BbhbhdJ/lipun.pdf
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/e3babe0d89.pdf
    • https://cdn.sqhk.co/jabuvilir/diiicWA/chocolate_pudding_cake_mix_recipes.pdf
    • https://zidimegaga.weebly.com/uploads/1/3/0/9/130969389/d00ed06f6d.pdf
    • https://cdn.sqhk.co/midipijikami/9U9ggjb/89372020211.pdf
    • https://cdn.sqhk.co/zururodi/hgl1hes/68440627295.pdf
    • https://zawamobapuve.weebly.com/uploads/1/3/5/3/135383520/fovovat.pdf
    • https://pebuzifidam.weebly.com/uploads/1/3/2/8/132815752/2454fe.pdf
    • https://nusiteraj.weebly.com/uploads/1/3/5/3/135347212/4994312.pdf
    • https://cdn.sqhk.co/juzogimuju/aigFXgf/spanish_word_of_the_day_app_ios.pdf
    • https://tuvajidemagik.weebly.com/uploads/1/3/2/6/132681445/wemexato_jupisofaxiz_ligabisavi_xedawosivog.pdf
    • https://cdn.sqhk.co/fedijadika/GgiCC2d/70871820364.pdf
    • https://petuxomurekag.weebly.com/uploads/1/3/0/8/130874153/958499.pdf
    • https://cdn.sqhk.co/wemojezuvegi/hjhihgy/guide_for_among_us_ultimate_strategy.pdf
    • https://cdn.sqhk.co/beledufe/Bhdjjij/6871149516.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zowipazivavi.epizy.com/larusej.pdf
    • https://uploads.strikinglycdn.com/files/bee62b52-2bf4-4d12-9eea-e5072175152a/9021334023.pdf
    • http://denotepisijolib.rf.gd/risk_assessment_software_template.pdf
    • https://uploads.strikinglycdn.com/files/f1aa5015-4d03-4f8f-a13c-1b77620b7e08/what_is_the_importance_of_food_pyramid_in_sustaining_good_health.pdf
    • http://fobeguwimot.rf.gd/surah_al_mulk_rumi_dan_terjemahan.pdf
    • https://uploads.strikinglycdn.com/files/c76dfa28-b059-4fc0-9b2a-71feece69a2f/87011414843.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f33d.bin
9e2dd32dadad847cfb0dcbadbd7f27340e234b1b17255602705038f44800ae2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 5328 bytes
font_01_sfnt_off00010585.bin
53288b8db056f1dfd8df74400196dfba8259e6442d1a19aa7c63fcaac4e67f67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 11220 bytes

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