Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c0708e40d85b4f…

MALICIOUS

PDF

69.8 KB Created: 2021-10-03 02:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c7aa1ede5f58a2706dcc486ed0da2c71 SHA-1: 9fe4e02ecef095142b9b086cee290c94607c4649 SHA-256: c7c0708e40d85b4fea3f329421208924cdbd49bf26cdba478d0c6a3883690c83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://leasingtowers.com/ckfinder/userfiles/files/zezogeg.pdf In PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/27566923554.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-16/20210916081304113997.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/doxebujotobixofajoxoxote.pdfIn PDF document text
    • http://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/35935755116.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/76920236688.pdfIn PDF document text
    • http://4bx.pl/public/file/fafagurixekanizejara.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/42653175497.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/42444199237.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/jogegevin.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161361df13b9ef---27570691766.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/xodikam.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/tumavewomis.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/xazamenuxa.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/damosepanudemosirudewoka.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/75087100224.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/godepisewube.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/87547605394.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/70911881530.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/wazesuvekazekajux.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/zuvasuwapewore.pdfIn PDF document text
    • http://tianfonmm.com/d/files/51741284894.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/wilokixotakavajo.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/d598dc113313c2400bb2450fe540c1c8/19543054047.pdfIn PDF document text
    • http://protok.pro/upload/files/25591240706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=convert+pdf+to+ms+word+onlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0A 15528 bytes
SHA-256: 9ed103a7cc1a10a105987ba482d34bfbd04f97595da508dd88051261c61697c4
font_02_sfnt_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 10680 bytes
SHA-256: 1151ab87ab96a5ce25dd1a8fd4dfa68dffd1be0c0705d31ef87f8595577ab4bd