Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3ddf808a4660a3…

MALICIOUS

PDF

68.7 KB Created: 2021-10-02 02:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02855219230f850a7a3d98b2ad6ffc36 SHA-1: 6e1874956f8b780c3011fcc1b94564f372b82846 SHA-256: 7b3ddf808a4660a36d335f88aaf2ea1f1622fb000737fe941f192eaa2941fe55
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating malicious intent, including random URL links and a link farm on disposable hosting. The ClamAV detection and ML classifier strongly suggest this is a phishing or malware distribution document. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content, likely for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crysiq.ru/uplcv?utm_term=android+18+cosplay+porn PDF link annotation
    • https://prestinieurope.ch/userfiles/files/85282570302.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161561bb0676ea---rizapugudileziravu.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/vuwijudi.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/rukogomejugikutukogalile.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/8797125805.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/15088767715.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/6903927254.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109011312507035.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/66353500740.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/23800353627.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/95238520068.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/vidapavuwazabusinuwu.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/22815329607.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b22b18ac7c---sesunegamebemelixovonewot.pdfIn PDF document text
    • https://bloomeng.com/uploads/13644298375.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/savagowaravunuro.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/30302353221.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210912_9CB4C803099EBBEC.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/44892319826.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/xunikufuma.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/duvexet.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/35798857529.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/kurovegadapemusapalel.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/87523512010.pdfIn PDF document text
    • 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_off0000ad63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD63 10632 bytes
SHA-256: 2ec2d57dcb41cd3f5f48e31a9fbb4ae66d066057c81407def586a77ad56d4014
font_01_sfnt_off0000c5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 14988 bytes
SHA-256: f79e84c6d2491041884220f24cf5dc47761f561f9307e695fe50633216bc28ba

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