Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd79637de03c1a91…

MALICIOUS

PDF

71.1 KB Created: 2021-09-24 16:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 51d8ebe0e8011a9587256dc334b84d09 SHA-1: e22dcce4da855a9f7aee83bf97beb4cb36fef700 SHA-256: dd79637de03c1a91cfba5980d99c45a592f5036e8cb975b18e8e2563f5ec7d6b
146 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or download further payloads. The presence of external links and the nature of the heuristics point towards a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=super+mario+snes+cheats PDF link annotation
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/nolojevebitolibodawedav.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/xegoxomasatabogodesine.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/43008131576.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/wiwakewisarev.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/11231064592.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/bisutukomazaxi.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/satonusororamajivesifiti.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/mibuzoxipuwukubosibegegoz.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/49562662035.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/nizofozizenukulomutusilas.pdfIn PDF document text
    • https://masukpt2.com/contents/files/pikanowujorifopa.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/32891767245.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/xenidomabemu.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/logemegajobujaf.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/44105446377.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ddb2132701eb60e82ffb094ad1f1773a/tepakakavetibiros.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/nonuveropopewowazolofa.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/87607420342.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/72931431588.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/gotokazafupimiwetokolaf.pdfPDF link annotation
    • http://margheritango.it/userfiles/file/nososofutumaguvarub.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161389c3354cb8---wonolor.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/86723592216.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/jozalaxasarilaxuloriromab.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/tibemi.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_off0000b47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47D 16208 bytes
SHA-256: be71f64419918cf5a8319baabd7272bf56587e4dcfe084fba40ffa89221b9732
font_01_sfnt_off0000ddf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF4 10768 bytes
SHA-256: 2eb56561c899c91a183ed1ccf09ab2917fe05e07d556fce248de715da79a59c4
font_02_sfnt_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1