Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbc0c9d7f87f7e3…

MALICIOUS

PDF

72.6 KB Created: 2021-09-18 11:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e0af7250186077c5165f8ef5fb88134 SHA-1: dc3f389595692e356857c90fe8da3dc891927ff5 SHA-256: cdbc0c9d7f87f7e35b09e18adc1077ec1ec5ef0e621984e5feab2522d998dbfa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the high number of distinct hosts indicate a deliberate effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=pokemon+blue+gba+rom
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/13168149758.pdf
    • http://dija.lv/public/userfiles/file/zokavezoxufe.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139e79a17707---gorozubotugopapawowekikax.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/kavasovenatabivafi.pdf
    • https://careerroots.net/ckfinder/userfiles/files/doxafagetabazagimerujal.pdf
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98876699002.pdf
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/51041646728.pdf
    • https://daqing-jewelry.com/uploads/files/202109101800467846.pdf
    • http://www.como-grup.ro/fisiere/file/12859122627.pdf
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/75471676984.pdf
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/73979338837.pdf
    • http://jiji.pgo.tw/pic/uploads/files/sirejarot.pdf
    • https://piauiaqui.com/ckfinder/files/xurizokadaz.pdf
    • https://seedcambodia.org/htdocs/cljr/data/files/balakemikudaxuvomu.pdf
    • http://taiwan-casters.com/userfiles/file/81567434710.pdf
    • http://songhandiban.com/uploadfile/file/2021091611212773499.pdf
    • http://hieuchuan.com/upload/files/64740182758.pdf
    • http://dispensapertutti.com/userfiles/files/noximafijiz.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/49553134426.pdf
    • http://chiangmai-esc.net/user_img/files/62976103330.pdf
    • http://citranco.com/users/files/migababipetazebiveme.pdf
    • http://exhibitionchannel.com/upload/vunezofewu.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/lijeferu.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_off0000b952.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB952 16792 bytes
font_01_sfnt_off0000d169.bin
e2c4d8a139abae06966f94a0a2f4664008d1ef0529198509ca0bc488952f4aa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD169 10428 bytes
font_02_sfnt_off0000e8fd.bin
adb3e50a1227ef6d806b0f6dffa64d9d82140a2b858d68086c79696c1dc2ebc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 16940 bytes

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