Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2444a0b0176173c…

MALICIOUS

PDF

79.4 KB Created: 2021-03-16 22:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5feba6a4b1937e3e6c353c9856a763ee SHA-1: bdab11e0c133d266d5044499ed23f1457108d337 SHA-256: f2444a0b0176173c0a66559416b1591bf25bb0290b618f5000a8006da6ba1801
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, and detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous external links, one of which is a direct URI to 'xezojetit.ru/award'. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure to download further content. The overall structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/award?keyword=k+means+clustering+algorithm+example+pdf
    • http://fezelegafefuv.mywebcommunity.org/dapara.pdf
    • http://movilatur.iblogger.org/26614867113.pdf
    • https://cdn.sqhk.co/wujejelot/djgjhhc/nova_launcher_fire_tv.pdf
    • https://cdn.sqhk.co/jepinixawide/bghjahh/katabatic_and_anabatic_winds.pdf
    • https://cdn.sqhk.co/runolisor/NEPjhff/revupatufuguroderibepat.pdf
    • https://cdn.sqhk.co/xubewarow/hhZ2Qhf/guitar_girl_relaxing_music_game_ios.pdf
    • https://cdn.sqhk.co/kutupejotige/XJ1jhih/wiwevabejumexej.pdf
    • http://uptodate.site/74987377950k9ynw.pdf
    • https://cdn.sqhk.co/vujenibolo/ghtkOgf/margherita_pizza_kingsville_maryland.pdf
    • https://cdn.sqhk.co/juvebuzizej/0jghcSR/zejujoxitoroxodu.pdf
    • http://giveaway2020.info/42438826510lhsnf.pdf
    • http://all-casino.xyz/how_much_money_to_start_a_video_production_companyrlxks.pdf
    • https://cdn.sqhk.co/xiroxozalal/aihxgin/34889358727.pdf
    • http://metikinave.22web.org/abstract_tesi.pdf
    • http://nunovoxiwanafuz.getenjoyment.net/renaissance_periodization_book.pdf
    • https://cdn.sqhk.co/fuwegamuvev/7WjfieQ/zombs_royale_unblocked_games_66.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://negumigimewote.onlinewebshop.net/vukogazele.pdf
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_a5c01123c19343469e8e926948fea413.pdf?index=true
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_3f056daf8c6d4e93950fe2438432bb77.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95a.bin
21a367032b7cabf2ea2c69d2b287b13a025e19f80472245db104a9cbcf8223e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 5488 bytes
font_01_sfnt_off0000fbd0.bin
c7f084c21cb77bb7e58a7c7f8ba00da517926d49a02f0701c2c5e66d5922c8d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 10996 bytes
font_02_sfnt_off000121a2.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121A2 4324 bytes

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