Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac50481b25b9e439…

MALICIOUS

PDF

69.9 KB Created: 2021-09-18 23:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9200dd240bc617f39b4989c0a283702d SHA-1: d4f89a674c952f7da674784f9ef6991f8708bf87 SHA-256: ac50481b25b9e4396696dc32685a991b111479fd6e3d469c81c4dfecce6da039
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of LOLBin tokens in the document text further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://medvor.ru/uplcv?utm_term=cheats+for+pokemon+crystal+on+android
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16134d1a8131ea---59753761257.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448d68e2e35---81488896923.pdf
    • http://banquat.com/userfiles/files/87336803101.pdf
    • http://hyosangjo.com/userfiles/file/20210906232130.pdf
    • http://tochuchoinghi.org/files/kinasupux.pdf
    • https://francemonde.news/UserFiles/file/xamefas.pdf
    • http://charmingcurls.se/upload/file/tasoketiv.pdf
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71191422271.pdf
    • http://biosurfest.com/userfiles/files/50435813186.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/56031588070.pdf
    • http://vitalchurchesinstitute.com/files/file/bekudituvomudu.pdf
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/97909368587.pdf
    • http://teplo76.ru/uploads/file/69667334384.pdf
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/xobijowiw.pdf
    • http://hotelgiottotorino.com/userfiles/files/gapot.pdf
    • http://aaaexpressheating.com/userfiles/file/kuvopabipaw.pdf
    • http://kuryakyn.ru/userfiles/file/99182458311.pdf
    • https://albawadiroad.com/userfiles/files/3226790806.pdf
    • http://hanifeugur.com/image/files/85852813338.pdf
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/63635999136.pdf
    • http://tmkb.org.tr/ckfinder/userfiles/files/26197464912.pdf
    • https://semineebrasov.ro/printuri-fi/files/rolikakalubinunikufejude.pdf
    • https://pmcp-avac.com/files/upload-ckfinder/files/sozarij.pdf
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/32884278736.pdf
    • https://bwawarszawa.pl/upload/file/relixevejerokabipu.pdf
    • http://ckattorneys.net/cu
    • 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://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_off0000b21b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB21B 16792 bytes
font_01_sfnt_off0000ca32.bin
067552a408b65fd9f7047e785fb1c69c91880492cb30a10aa93fc029675cdcaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA32 11124 bytes
font_02_sfnt_off0000e408.bin
53d3388418fa2ed939060b4ee26705b2554a04dfc949833902f355306d1385bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 14872 bytes

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