Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1be888ad9d64e9…

MALICIOUS

PDF

70.4 KB Created: 2021-09-15 09:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59e6e33d4959b667b27b2ef027d5cfe8 SHA-1: 0d15fa0796f7404162dbc75f4ab2b2e3a49c71fd SHA-256: 5f1be888ad9d64e9a41b2a954cad2f84fb4cbc29c69fb24b22d21450f19048d1
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=tom+and+jerry+and+the+chocolate+factory
    • http://knipia.com/userfiles/file/janexewew.pdf
    • http://bentleyplemtech.ru/userfiles/file/2644019160.pdf
    • https://prtl.pl/userfiles/file/77567361677.pdf
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/ruxexuwiwupezebefula.pdf
    • https://vnmmalta.com/userfiles/file/56543424231.pdf
    • http://fatamorgana.fr/uploads/assets/file/jovarim.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/14158312704.pdf
    • https://euro-m.si/web/dokumenti/file/48882509531.pdf
    • http://thessalonikiflights.com/files/files/diwosoravopi.pdf
    • https://wrd13.com/force/file/gavinovitebixego.pdf
    • https://etonbio.com/newsLetters/images/file/xajos.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/39206cd0fa57a1231b785ee15ab6b25f/52866478953.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/kekatipo.pdf
    • http://an-professional.ru/img/files/file/33763409264.pdf
    • http://madurastones.com/userfiles/file/nularaxofotadugiwo.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/6g2qhttpukt4a6o5pbp554fggn/67406980778.pdf
    • http://fcraregistration.com/UploadedData/file/45261771855.pdf
    • http://stauarchitetti.eu/userfiles/files/44599426818.pdf
    • https://monamifrance.com/FileData/ckfinder/files/20210914_EBF202D29C3749A0.pdf
    • https://hantverkarenisandby.se/UserFiles/files/78326594568.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/87601441022.pdf
    • http://www.pranabkumar.com/fckimages/file/54802753934.pdf
    • https://verticala.ro/images/userfiles/sejivaj.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_off0000b4f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F3 16792 bytes
font_01_sfnt_off0000cd0a.bin
b093335e88b10931333f3d62e992f59f0d4df02696849aeec7342d12f3781eb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0A 10688 bytes
font_02_sfnt_off0000e564.bin
850653467f420fa686ee04d08af405882a1f518d77fdc67f5ac50bfca42d03c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 15472 bytes

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