Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8eabf6a07947f2c…

MALICIOUS

PDF

79.3 KB Created: 2021-09-20 04:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 745e435532c1c0ba3eb09a725947b15b SHA-1: 1a808c106ab624d7f577c069ce4a74de10053d23 SHA-256: c8eabf6a07947f2c4f4c2bc92e8bc75820776b62467f8ceb04c16b9abfb5ce48
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one identified as a link farm on disposable hosting, suggests an attempt to redirect users to malicious sites. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern, aiming to trick users into clicking a deceptive download link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=new+movies+download+websites
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/90212217016.pdf
    • https://dynasty888.com/image/files/20210912_025553.pdf
    • https://markmont.eu/editor_uploads/system/files/govodabetimavawe.pdf
    • http://liceoadultos.juniorcollege.cl/userfiles/files/rerar.pdf
    • http://taxplus.in/images/contentimages/files/52997326554.pdf
    • https://dongcohonda.com/userfiles/file/fitevu.pdf
    • http://naosgym.com/userfiles/files/ketegonopejofupugukagakux.pdf
    • http://bagodilovaspark.hu/userfiles/file/86867896674.pdf
    • https://crcnueva.naturasoftware.com/uploads/images/files/8997884405.pdf
    • https://pokereshop.cz/data/file/21197572861.pdf
    • https://argumentua.com/i/file/61668759267.pdf
    • http://dyccpharma.com/upload/files/tumig.pdf
    • http://mmckno2010.zkosuchdol.info/files/64906027760.pdf
    • http://traiteur-ribot.fr/userfiles/file/52272853609.pdf
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/23893625279.pdf
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/vesuwojemojiloronawe.pdf
    • http://accessiblevehicleservices.com/userfiles/file/21217086513.pdf
    • http://aeusjtu.pretty-match.com/upload/files/54415677145.pdf
    • http://collectifff.be/imgdb/accueil/files/rajuwideperewi.pdf
    • http://onthebroadway.com/CPD/adminpanel/upload/file/95045996032.pdf
    • http://climacom.eu/userfiles/files/18787808715.pdf
    • http://mdsalon.ru/img/lib/file/tozupezobofux.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_off0000d2f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 16792 bytes
font_01_sfnt_off0000eb02.bin
2c23dbaa2c9b2d24648d0ff08c69d7afa3d639dadcc1332c6d69349c71872935		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 17152 bytes
font_02_sfnt_off00011771.bin
9757a0af98caad3609436514e102b4bfb113b21140fefe8516e7ae22056a5a98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11771 10580 bytes

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