Malicious PDF — malware analysis report

Static analysis result for SHA-256 47fd127369e58f00…

MALICIOUS

PDF

72.7 KB Created: 2021-09-22 09:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37323ed5846cdf0a79b82d6519743568 SHA-1: b74d9a82ffa591a3bccc2975dd2ebd1374a09a29 SHA-256: 47fd127369e58f00e768bf724f8c66cea45182347df7c3d73e348206c11f3973
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm, likely to obscure the true malicious destination. ClamAV detection and ML classification strongly suggest malicious intent, pointing towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://elma1.ru/!upload/files/12178629938.pdf
    • https://vaynhanh365.net/contents/files/wimaporu.pdf
    • http://globalbizkorea.com/userData/board/file/41223865179.pdf
    • https://novinfasteners.com/userfiles/file/gobiwubugo.pdf
    • http://nitexprofi.cz/userfiles/file/lekogosuxupotilonojuwad.pdf
    • http://elosc.com/upFile/file///ITX202109181419098767.pdf
    • https://karlholmbygg.se/UserFiles/files/84241808708.pdf
    • http://adacu.org/userfiles/file/20210908063134.pdf
    • http://xahuaheng.cn/userfiles/file/95304695510.pdf
    • http://elisa5888.com/shopadmin/upload/files/25830846278.pdf
    • https://kingwaterpure.com/ckfinder/userfiles/files/vivuba.pdf
    • http://fbrasil.com/userfiles/file///63468416770.pdf
    • http://santeh.md/img/files/filiziwabelojivu.pdf
    • http://kursadowicz.pl/Upload/file/44376433070.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/netufodewemolubipusu.pdf
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/sedutigotokojiledemesar.pdf
    • http://travelshops.pl/userfiles/file/dipawodopurazeso.pdf
    • http://prvugkh.ru/uploads/files/wuxefevoguvigoru.pdf
    • https://clubon.top/uploads/files/romifubotarovis.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/25065772241.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142c5cf4b3fe---surebigawiraxagifosukeji.pdf
    • http://abwingstop.com/uploads/files/48142257013.pdf
    • http://gowowdeli.com/uploads/files/dupowalavegixukalagas.pdf
    • http://studiobonvino.com/userfiles/files/dosoboxalomot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=podomatic+app+for+android
    • 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_off0000b906.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB906 16792 bytes
font_01_sfnt_off0000d118.bin
4389161382e70ed759d839355651d5fa5bfc308556fe49515e50c79b1f633626		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD118 16764 bytes
font_02_sfnt_off0000fc17.bin
f87bbbdbb07301f9722c7d0c65b711352e9b8c1c91347a2a620af5538c7cfd26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 10436 bytes

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