Malicious PDF — malware analysis report

Static analysis result for SHA-256 8800a3c701b57d7c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 03:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9acbb44489545408062718aad4d3983b SHA-1: 7cb067f8bd7a58073567ed87e4bf594513f8a838 SHA-256: 8800a3c701b57d7cc827892e2d6353c73a5f955c91c264bd63eb6a90f9abc751
134 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and numerous external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm strategy, and the presence of embedded JavaScript points towards potential exploitation or redirection to malicious sites. The primary URL identified is https://krisoc.ru/uplcv?utm_term=apps+to+download+mods, which is likely used to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://krisoc.ru/uplcv?utm_term=apps+to+download+mods
    • http://konakelektrik.com/userfiles/file/romiriwanojotumed.pdf
    • http://nj-rshb.com/v15/Upload/file/202195187307593.pdf
    • https://coffeetuanvang.com/Images_upload/files/zuwuvaki.pdf
    • https://majubesar.org/contents/files/68644412685.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/pelexajazuwakuririvef.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/09hml02elp210vp02j21ddhpae/60849736042.pdf
    • http://golden-candies.ru/webroot/files/files/dosidenizorezes.pdf
    • https://sayurmateng.com/contents/files/kumaturodujiridazos.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933511cb93---dizunedewasasadizokebib.pdf
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/89045869616.pdf
    • https://istruttorecinofilo.it/userfiles/file/vadolizodito.pdf
    • http://hosteleriayvending.com/ckfinder/userfiles/files/tamamelanabikinuxup.pdf
    • https://premium-house.uz/images/file/nifodoz.pdf
    • http://baltic-rt.ru/ckfinder/userfiles/files/gurog.pdf
    • https://kitapkapla.com/upload/ckfinder/files/tiworarupewevavunudepuv.pdf
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/sososigux.pdf
    • https://noriupapildu.lt/ckfinder/userfiles/files/8116913341.pdf
    • http://heyumpnd.com/userfiles/file///wogoref.pdf
    • http://chaukitchen.com/uploads/files/mivomepedotujefomelaxula.pdf
    • https://slicktechproducts.com/newerac2c/userfiles/file/tomakelenil.pdf
    • https://stpatswatertown.org/ckfinder/userfiles/files/bobisitomofute.pdf
    • https://associazionedynamica.it/uploads/file/nokosubinodi.pdf
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/26329121344.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_off0000d9c2.bin
78a225b7c56b4fa09c97e336be54130130dc2810616980219b5d1ef25eef2804		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 17896 bytes
font_01_sfnt_off00010829.bin
cc321ad3d9203e39df726215331438a299dedd60e0c05d545d25f5228e3d4cd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10829 10296 bytes
font_02_sfnt_off00011f71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 16792 bytes

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