Malicious PDF — malware analysis report

Static analysis result for SHA-256 eadcea1a5cd82a19…

MALICIOUS

PDF

86.6 KB Created: 2021-09-20 11:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db8f57c2d78dd11e17921a46ae902db3 SHA-1: 582b00a9622145167dec2771edeaa4197ed2ad59 SHA-256: eadcea1a5cd82a199892b87b74b491d8de350b63902726899a248a54bba8ecd5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Numerous external URIs and embedded URLs point to disposable hosting, indicating a link farm designed to redirect users. The PDF structure and numerous links suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=ios+13+emoji+for+android
    • https://educhina.mn/editor/files/jujutuzuxonuguwo.pdf
    • http://mishelik.ru/userfiles/file/pamoloxabufolixiwaketuvu.pdf
    • http://ps-chiptuning.hu/userfiles/files/loxatodimugafidiwagujo.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/73380329044.pdf
    • https://ntct-dz.com/ckfinder/userfiles/files/45795042334.pdf
    • http://csc-vietnam.vn/uploads/userfiles/file/juwuji.pdf
    • http://falegnameriacastiglione.it/userfiles/files/12192304541.pdf
    • http://www.beverburcht.nl/upload/files/mesoxewa.pdf
    • http://japanbizkorea.com/userData/ebizro_board/file/zoratoxavo.pdf
    • https://esofagopisa.it/userfiles/file/29164646818.pdf
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/72572188382.pdf
    • http://orderkai.com/uploads/files/25123109878.pdf
    • http://bouwbedrijfansing.nl/userfiles/file/33568979256.pdf
    • https://chung-pei.com/userfiles/file/lunumamoxivirewuwewamulop.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133631db1232---nefar.pdf
    • http://getampedmag.com/ckfinder/userfiles/files/tifuvugobovowe.pdf
    • http://nextgenship.net/upload/file/20210906163090923639.pdf
    • http://lokalizacja-gps.pl/userfiles/file/73372949377.pdf
    • https://directorvincentchow.com/fck_filemanager_upload/file/61374626552.pdf
    • http://www.urbanwaterways.info/files/47898347358.pdf
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/54679996887.pdf
    • http://elskup.pl/images/assets/file/mupivevijomav.pdf
    • http://montazenabytkupraha.cz/files/file/33957742552.pdf
    • https://ofertaromania.ro/ckfinder/userfiles/files/24061644994.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_off0000eccd.bin
9f01393c979072f2579b8cbb9faee9eef64f0ee42ab861a8e577d3bd02fa204d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 10676 bytes
font_01_sfnt_off00010548.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 16792 bytes
font_02_sfnt_off00011d5a.bin
648a032b1e053988fb7ed80414302de2ebb9ab6adae06424c57e3a04b4c37c85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 18288 bytes

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