Malicious PDF — malware analysis report

Static analysis result for SHA-256 a766ca22867df372…

MALICIOUS

PDF

76.6 KB Created: 2021-09-17 03:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3977a092d1edb671e2e433eef2c6ffb SHA-1: f706c9618b0f45572993498cbc5ea2b3c65111f1 SHA-256: a766ca22867df372576df5b449c3e7d3f1c4bc006edab1a7186dca933f2454de
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains numerous external URIs pointing to disposable domains, suggesting a link farm designed to obscure the true destination or distribute malware. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://irlanc.ru/uplcv?utm_term=rise+up+premium+apk
    • https://svezadjecu.me/userfiles/file/mogujikifek.pdf
    • https://tourgardan.com/basefile/tourgardancom/files/63001989138.pdf
    • http://cu-mbc.com/ckfinder/userfiles/files/fuxezegetojotumubegiduxuf.pdf
    • http://thumpamonpally.com/userfiles/file/49706469029.pdf
    • https://balajitutorial.com/admin/userfiles/file/72620015531.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef34b03162---54905601256.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/nidezujepabana.pdf
    • https://aventura-agence.lu/userfiles/files/67131012648.pdf
    • http://talentfuturesservices.com/sharpinstitute/images/files/vituvufo.pdf
    • http://hoteldanang.com/uploads/images/files/solinel.pdf
    • http://suliaok.com/v15/Upload/file/202192527451122.pdf
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/jomir.pdf
    • http://studiotecniconuti.it/userfiles/files/32355776816.pdf
    • http://affordableadobe.com/ckfinder/userfiles/files/70472211893.pdf
    • http://studiodabo.eu/userfiles/files/18221610398.pdf
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xonajoji.pdf
    • http://ediliziaunoaventi.com/userfiles/files/walitebubimotakijavugosa.pdf
    • http://www.northern-japan.com/image/upload/File/lewalarusowawufalubuwaf.pdf
    • http://flemingdecal.com/uploads/assets/file/98591157182.pdf
    • http://architettotoma.it/userfiles/files/57558638532.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/mexoromi.pdf
    • http://adabaskimerkezi.com/upload/file/memevirakaxobugem.pdf
    • https://cvsc.co/userfiles/file/siravawowunanu.pdf
    • https://rkdestate.com/userfiles/file/84580518713.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://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_off0000c8ad.bin
59175bd3f6419a2b9337d3fdee2aa010c4b80bf8e4adc1d4d0107726b6e7e957		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AD 17528 bytes
font_01_sfnt_off0000f648.bin
f5bc01b10bafe8aafbc2d0f490ca5259b851a153ab9883b7f6728aba1e482284		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 10284 bytes
font_02_sfnt_off00010d6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 16792 bytes

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