Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdc1b4d577cf9d2…

MALICIOUS

PDF

81.0 KB Created: 2021-04-01 22:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 088ff2a01b258abdbceab91464a081eb SHA-1: 7e520220cb31a0c7c30bcdf2ec366ccf96f372fd SHA-256: dfdc1b4d577cf9d275ce979cf90d1efd124c254dd9c7d33f977d5f9d420479f3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to local business searches, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/strik?utm_term=nail+shops+open+near+me+today
    • https://cdn.sqhk.co/lexelinowe/jghfjd6/dinakevijej.pdf
    • http://kupivse.xyz/bejijowenosoxowizhjpht.pdf
    • http://loveantravel.xyz/gepalazupowuranaxujidx59d.pdf
    • http://sacredname.ru/how_to_get_a_link_to_the_past_on_switch0lagb.pdf
    • https://cdn.sqhk.co/dufimogemeka/mo1jiig/hamster_rescue_illinois.pdf
    • https://cdn.sqhk.co/gedugari/Zc5hhy3/saluwavuvuligiw.pdf
    • https://cdn.sqhk.co/duwutawuna/d1hjj6L/yellow_line_paint_on_my_car.pdf
    • https://cdn.sqhk.co/fosuzonarefi/VEib6k9/borland_c_free_for_mac.pdf
    • https://cdn.sqhk.co/letarezetap/iihhef5/96373328558.pdf
    • https://cdn.sqhk.co/lilovenodi/iawlgjW/mamivujoxufepoba.pdf
    • http://scandisvet.ru/sibogasidapidawarics1pq.pdf
    • https://visimekariluvog.weebly.com/uploads/1/3/1/4/131483525/82255.pdf
    • https://cdn.sqhk.co/gusisitixinu/Ivvgh1G/zombie_squad_crash_racing_pickups.pdf
    • http://agreevudb.rest/basic_probability_theory_robert_ash_solutions2k2bu.pdf
    • http://bavunexebiri.iblogger.org/florida_department_of_transportation_medical_examination_report.pdf
    • https://nuzilemuf.weebly.com/uploads/1/3/4/4/134479477/zepuboz.pdf
    • https://cdn.sqhk.co/rotonoba/Sl0jihj/25935259626.pdf
    • https://cdn.sqhk.co/xudapurofoz/BgdNrP8/95428793314.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gazinopalevigem.rf.gd/nutexotisevukun.pdf
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_7d857990959f455f86c7751b787ca336.pdf?index=true
    • http://morinebasipu.rf.gd/munimis.pdf
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_bd66eccf1aa841898cb8ae1d5f17cef5.pdf?index=true
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_56ca9d26cdd4427d962873aef673138f.pdf?index=true
    • http://tuzugewidided.rf.gd/90564616857.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_off0000fe83.bin
f9f02726424ef4d6c64fa3b9d49f6b713396a305fbe74207039e93f5f901c541		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 5268 bytes
font_01_sfnt_off0001104b.bin
f04e1927996c8e4280d4c8f87e6a13ded15a11613d029279309cd5243dfda774		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 11128 bytes

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