Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fc41f7b89d75c1…

MALICIOUS

PDF

75.9 KB Created: 2021-09-12 10:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e68d5003b7593fb424eea8f766e8fdf SHA-1: e5525dc643119f9f6a4276756e37eb4dd2ad5592 SHA-256: a8fc41f7b89d75c1e03db765533fff61cf1e4962709165569f3b84b4b26eac71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL with 'utm_term' parameter indicate a phishing or scam attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://irlanc.ru/uplcv?utm_term=super+vpn+free+apk
    • http://angel-conference.org/upload_fck/file/2021-9-5/20210905134822266818.pdf
    • http://sooam.com/files/fckeditor/file/578362846139bf0e347e0.pdf
    • http://chothuexehochiminh.com/userfiles/file/60438137718.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f17e008841e1b39fca5904b7a19836d9/47410182926.pdf
    • http://huerural.com/uploads/image/files/fipolosasejutopenaxipoluk.pdf
    • http://tipiland.net/upload/file/10573730634.pdf
    • http://autosoftware.company/autoresponders_images/files/titupopibipafirazubikese.pdf
    • http://noithatmyhome.com/img/files/94589509150.pdf
    • https://ctyhoanongangiang.com/userfiles/file/7992569881.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16136a1a50d221---54240049516.pdf
    • https://kimcert.com/E/file/4881292140.pdf
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/fewulokizutexavolad.pdf
    • http://tms-technology.com/ckfinder/userfiles/files/pavagudesasewaxuza.pdf
    • http://megatex-plast.ru/pub/file/86886093287.pdf
    • http://dorp.pl/userfiles/files/diberajito.pdf
    • https://premiersuli.hu/files/files/suziwolomurufijisi.pdf
    • http://gdlejia.com/uploadfile/files/20210903_095040.pdf
    • http://teakdeck.pl/files/file/padunonejotiluren.pdf
    • http://cen7dias.es/userfiles/files/54175885195.pdf
    • http://cluboutletmoto.net/campannas/file/65613990734.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/popanolexupodotu.pdf
    • http://hkbroadwin.com/userfiles/diwifodusux.pdf
    • http://metalzilemboeventi.com/userfiles/files/pupud.pdf
    • https://aslimitada.com/userfiles/file/84935503354.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_off0000c77a.bin
ae9331ef9e9993be5e929eaf06026a668fcbb9f4051d0f8bcfeb4009c37666e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC77A 17048 bytes
font_01_sfnt_off0000f3af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 16792 bytes
font_02_sfnt_off00010bc6.bin
acc3fca679a352e5bf3047f26b77ce6c8a465ccaa00796151228c8a96d8a5d66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC6 10160 bytes

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