Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f5390fd47d4e07…

MALICIOUS

PDF

82.5 KB Created: 2021-10-11 23:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0a63f9208b82822a62e7ffd483618168 SHA-1: e2c1d363dd5cd19fbcd7e5e4901e09d368b0b1f9 SHA-256: 03f5390fd47d4e07321d5372b4cc1cef491aee9e0aba507951625826edb43bbd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=non+mendelian+genetics+problems+with+answers+pdf PDF link annotation
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/84564363317.pdfIn PDF document text
    • http://119pump.net/d/files/minajuzibixivijunuzevu.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/60794035539.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138faf5243b0---fasutonax.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/karixejarafinubavakazive.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/xedivulatoxiko.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/86769304778.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/mukojil.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/44258125401.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/36864037081.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/5880860664.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/saziboxixad.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/gebobotami.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/79246072264.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/82358a362477094e4a38f2f81e3053e1/vovafelagigi.pdfIn PDF document text
    • http://aurora-c.jp/files/files/72973188590.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/29765086037.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/50095870290.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021108118487023.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/vofel.pdfIn PDF document text
    • http://julianina.de/upload/file/jibos.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/letanudelebiboselajimupaj.pdfIn PDF document text
    • http://belean.pl/userfiles/file/rigefenibi.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/joxanefa.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/jufebajukajixunasedopad.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_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 18700 bytes
SHA-256: 3aa7d19b4e94798deb7025630badffc5fcc9560e23abc25266eae34eabb3f40f
font_01_sfnt_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 11268 bytes
SHA-256: 6abb2b9ff0ba6cb6e507b346e5a2e9fff8d7d5ba2e2809bc361537c4ba05ce68