Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6dec8752a901a3…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 15:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45c44befb19adfa08e24bd2722f681f2 SHA-1: bef5b8a8358caccdeca151c8d48739d3bc583dfb SHA-256: 7c6dec8752a901a3b8da15eb6bf2d8f6fea0b25952d0a5014498a59c801efb26
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's primary purpose is to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.ujepites.hu/userfiles/files/larikuvugofujakekalodak.pdf
    • http://imaginove.eu/data/Files/bojod.pdf
    • http://madmojo.com/fckupload/file/68886407701.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/wulodonevurebud.pdf
    • https://bnbcostaverde.it/userfiles/file/95489330515.pdf
    • http://imoroz.by/upload/file/tetegoxofa.pdf
    • http://dailymaydemtien.com/userfiles/files/defulonabanepula.pdf
    • http://bananamusic.tw/uploads/files/202109092252575089.pdf
    • https://thebottombillion.org/business_school/uploads/file/tanowoveneso.pdf
    • https://nocenzura.space/web/img/podborky/files/lumexokupixolegimed.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/jitefiwogaperedevuli.pdf
    • http://nghieuphong.com/upload/files/vutadexidogojaku.pdf
    • http://ankaraeksioglu.com/resimler/files/temuxenofif.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161316b1c5aee6---36091660442.pdf
    • http://santeh.md/img/files/gozozifogemoterumepog.pdf
    • http://www.astmalek.cz/obrazky/file/87535672777.pdf
    • http://noxsun.com/jingkelun/userfiles/files/20210907020014.pdf
    • https://olterus.com/contents/files/906731555.pdf
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/defefi.pdf
    • http://jsqnchem.com/upload/files/xukozulil.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/90513be467a8cbcfcef3919a91268a69/15207945313.pdf
    • https://dcoderesearch.com/uploads/bizegiwigakaked.pdf
    • https://landi-bg.com/images/file/31148725397.pdf
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/86480859684.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+software+problem
    • 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_off0000d45e.bin
50892f948438d24264b3dcbcd54c449bd31d7dcf25bd338d0eb1d3e9a54ce2b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD45E 10868 bytes
font_01_sfnt_off0000ed46.bin
574274d8c140e526e18fc210b38bbfeff8c2214784a7e997d0c838533b3594c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 18356 bytes
font_02_sfnt_off00011c7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7A 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.