Malicious PDF — malware analysis report

Static analysis result for SHA-256 38335635fda02a35…

MALICIOUS

PDF

70.7 KB Created: 2021-09-14 18:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a9d03f608ad4e2b22af1cea7721c88e SHA-1: 3fc99196c035167c73bd7ef26e2ae7f7f507d081 SHA-256: 38335635fda02a35d8aba37aeb2123ff3009c5d26e93f00ff3f94be8ab8e1e76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, a characteristic of link farms used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to malicious content, likely leveraging T1059.007 if any JavaScript was present but not detailed.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=watch+gods+of+egypt+online
    • https://shevtsov-art.com/uploads/files/20405168471.pdf
    • https://procogs.com/FCKeditor/file/30266488847.pdf
    • http://dui-antidote.net/images/userfiles/file/zowurififajusudababusog.pdf
    • http://gibkrakow.pl/uploads/files/soguzovawosexibatowini.pdf
    • https://ww150004.linebot.net/upfile/files/20210907151140.pdf
    • https://togeltop.net/contents/files/50211159339.pdf
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/7014135618.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/88707413386.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0a5b493f9e98aec4aba96200f8728839/41177831755.pdf
    • http://abbwingslynnhaven.com/uploads/files/vevuwodo.pdf
    • http://chip-chup.hu/upload/file/65271498359.pdf
    • http://climtech.com/files/files/92344141737.pdf
    • http://rutka.pl/media/upload/files/944fa0840ca60adc52b1350fc2738bdf.pdf
    • https://testgit.begurholidays.com/uploads/userfiles/files/pifixebuxusa.pdf
    • http://shopphutungmayphat.com/upload/img/files/bilebivujatubekuvofiroge.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/vajuw.pdf
    • https://ceccardolj.ro/userfiles/file/95541866103.pdf
    • https://arerp.kr/data/file///35801499979.pdf
    • http://improntediteatro.it/userfiles/files/94635146932.pdf
    • http://argyleliquidations.com/userfiles/files/66587302156.pdf
    • http://veterinariacomportamentale.it/userfiles/files/xisakumakokinupezewojawa.pdf
    • https://tideandtigers.com/ckfinder/userfiles/files/bukogarux.pdf
    • http://designbyjoseph.com/uploads/File/96400777943.pdf
    • http://bkm-market.net/userfiles/file/pudafanowarovikisi.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_off0000b293.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB293 16792 bytes
font_01_sfnt_off0000caa5.bin
ce2e806a36c1757dadda2ccc5fcb44e0191a0e49718ba6c7776df38fbc39ae96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA5 16228 bytes
font_02_sfnt_off0000f45a.bin
faf2f712301319d8b7d047ccaeef369c2ff771b6c1b817d6bb79a1252b702fda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 10908 bytes

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