Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb10044ce6f3cb2b…

MALICIOUS

PDF

88.7 KB Created: 2021-09-19 15:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f9c6013fb335032f04909d44273adaf SHA-1: 29865639bcf44a965a345d8233d445db2d930fd8 SHA-256: cb10044ce6f3cb2b360a9de027919923e84a25a54ec6e926e1e24f4da70efa7c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload. No scripts were extracted, but the overall structure and heuristics indicate a malicious intent to deliver a secondary malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=fastest+vpn+for+pubg+lite
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/83169332976.pdf
    • http://teifsepahan.com/files/file/sinuxugujowakapekarinivi.pdf
    • http://studionegrelli.it/userfiles/files/wakeruvu.pdf
    • http://fasson.vip/images/editor/files/zutikizeb.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376b566cc05---49541108074.pdf
    • http://zuche0551.com/upload/file/51624827271.pdf
    • http://kfbma.org/files/fck/file/38289001998.pdf
    • https://dongcohonda.com/userfiles/file/41767685374.pdf
    • http://duetsepolno.pl/userfiles/file/4081352981.pdf
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/vegafafesirajakurokil.pdf
    • http://e-menu.hu/editor_up/fevoz.pdf
    • https://makenie.com/upload/files/tazufali.pdf
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/ragofose.pdf
    • http://songhakbbq.com/uploads/files/57931762704.pdf
    • http://brno-skoleni.cz/ckfinder/userfiles/files/ludosumirakegibowexo.pdf
    • https://cafemocion.com/userfiles/file/fuborawu.pdf
    • http://7sate.com/filespath/files/20210910201958.pdf
    • https://inprovitcolombia.com/ckfinder/userfiles/files/76853234898.pdf
    • https://dazhonghua1688.com/ckfinder/userfiles/files/20847673701.pdf
    • http://tokyoto.pl/UserFiles/file/bodap.pdf
    • http://tlumacz-lipno.pl/pdrzewiecki/files/5327908872.pdf
    • http://ahlhy.com/uploads/file/151951254677.pdf
    • https://barcelonamedicalcenter.com/files/galeria/files/zedewagifunewireret.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237b8ecd62---ximuxuxorowizenonun.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_off0000f786.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 16792 bytes
font_01_sfnt_off00010f9d.bin
4318f5e589df7118aac51e9b51d495d1c3577ed274bdbd91d067234f90ecc009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9D 10816 bytes
font_02_sfnt_off00012875.bin
ac973a7b349da0a75584e9a98b9b2eb7f5256ebb4628f4aadb4c8000568b8d60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12875 17124 bytes

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