Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad57d212e5cb044d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 03:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c599012768e4a72a81ee49ca3f2b9d1 SHA-1: 96dbd73ff8e43c57d19fa45850c49b487876c974 SHA-256: ad57d212e5cb044d4295a7cf74c448e347ad476a35745b911065a0a4c7ae0a26
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://archism.ru/uplcv?utm_term=how+to+transfer+data+from+old+phone+with+broken+screen PDF link annotation
    • https://lolakarimova.uz/ckfinder/userfiles/files/8543177587.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/40945596937.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/88422937353.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/zirokemodigipave.pdfIn PDF document text
    • https://nasikampung.info/contents/files/51040179064.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/sudugijopolidatataxoj.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/69061029496.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/goxivimuxeroleme.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210907_073317.pdfPDF link annotation
    • http://startent.ru/SITE/files/editor/file/99685643387.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161385b74e8122---wotivewovamebu.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/kotudubugaro.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/44033597379.pdfIn PDF document text
    • https://fptica.ru/images/file/zenasoxerubukimop.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/16852050805.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/16283744552.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/12809368529.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/gujevilikekejebuner.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/rarikamaraluvekikovadi.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/13427485825.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/pojejis.pdfIn PDF document text
    • http://sayarbobinaj.com/file/58890050095.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/nofakonusena.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/57063802160.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613590400d888---pezojoxuneki.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/juzifomowi.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_off0000d79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 17788 bytes
SHA-256: f0a20de82f9a73278ebf1f11ab2225e1e2c8f9d94ea434330a8c23b5fb5226fa
font_01_sfnt_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D77 11192 bytes
SHA-256: 2962ce209c9ba079d2c7a02abba9e66fbb640df43aac0dc550ec7fdf9cdc2e8e