Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e602aea0553a603…

MALICIOUS

PDF

84.7 KB Created: 2021-09-14 05:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f325f1336809cac56fdd601649268c94 SHA-1: b203a4ce16f257afe90693ed4fa97f591c70ac1f SHA-256: 6e602aea0553a603ff5067c9460167ea820aab509b046aa87b5948959e910d4c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URIs pointing to external websites, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The presence of an IP address literal in a URI further suggests suspicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://philabc.ru/uplcv?utm_term=j+adjectives+to+describe+a+person PDF link annotation
    • http://namlinhchisapa.com/userfiles/image/file/19408535137.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/dixupamod.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161362d037f3d3---lopesaxemenalaz.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/zexavifodeto.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/nezetotijowozudijupip.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/74811769449.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/69805829460.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/11788429582.pdfPDF link annotation
    • http://universalestetic.com/userfiles/file/75524546907.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/71381990486.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/fibenunifawesuku.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/35142486666.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/426536249.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/11158603334.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/begeg.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/47475757272.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/neniboxejosisegasiga.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/84450683791.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/21657327137.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/98920942000.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109021957232198.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/ganigepoxad.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/wuximobopufamovi.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_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 10788 bytes
SHA-256: c9098ae040043afa0076c1b411582cf9ae39f61a80257c0f6f157e97f76699d8
font_01_sfnt_off00010162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10162 16880 bytes
SHA-256: 13d2ed87760f48dc90d7d99e487b5dc6b560442d80a15672bd3405df1f9e0d8d
font_02_sfnt_off00012ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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