Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf8ea2bafef733b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-11 09:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5bd49696f36927551a9ddb3390439fc3 SHA-1: 1bff5c21b1b9e734b38478d10822cd24272f752b SHA-256: ddf8ea2bafef733b357d4df30124059493281c3be3cc1d19c8cb3ad0b80904ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a technique commonly used in phishing campaigns or to host malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns suggest the document is designed to lead the user to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://gardena.crazyrockinsushi.com/uploads/files/dinez.pdf In PDF document text
    • http://ryanoomen.nl/uploadimages/files/xanapopuvagorogitevadi.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161324b5fad518---81500861691.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/65543382097.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/23986215574.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/60742186584.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/denumigoketesubixozu.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/29552528665.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/lawinenumiti.pdfIn PDF document text
    • http://maxbrio.kr/files/files/64780151982.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/54195593344.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/ximerumojes.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/35744724881.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/38594023840.pdfIn PDF document text
    • https://agrando.cz/files/file/37422244629.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/fapodubaduxoriton.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/20078525467.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613172c7bfe6b---41014482180.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/xefavob.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/gixexugeg.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/luzapagopeb.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/nodurosopebevibis.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/vujamiwavinine.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/nabokimox.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/goziwadubilojozimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mini+warriors+unlimited+crystals+mod+apkPDF link annotation
    • 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_off0000dd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 18488 bytes
SHA-256: 7deb309e5b98a0f83646f29785220e0179b516a2d72108af6b2f705cf02dadf5
font_01_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001255a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255A 11060 bytes
SHA-256: 9698b1fd28a7ca73ec56b8aeb8c1a9fc1031799028ce65167d5a84dd1c5f508d