Malicious PDF — malware analysis report

Static analysis result for SHA-256 921d6ba544d1fe82…

MALICIOUS

PDF

70.0 KB Created: 2021-09-14 09:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c8d594d096eac965f7c98b7104e9a39b SHA-1: b368bd6b83e0c62b091898649324a66c9d4aa50c SHA-256: 921d6ba544d1fe82e6681b033012be03950058231bca98c895c1190322ebe50d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs, including one pointing to 'irlanc.ru', suggesting a phishing or malware distribution attempt. The PDF's structure and embedded links indicate it functions as a lure, likely to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=gta+vc+stories+apk PDF link annotation
    • http://hsi-international.com/ckfinder/userfiles/files/81291312686.pdfIn PDF document text
    • https://tekartltd.com/upload/files/11695051337.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/jowutofulipuxivejerutota.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/mugexurefudonipuzozize.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/fujozaniginewuvubuzuzezo.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16140374072e7e---fixevopalomurubo.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/19095011072.pdfIn PDF document text
    • http://juentai.com/userfiles/files/5127375570.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210903074909_1193313252.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/buzivakupopepone.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/85098873660.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/45536090064.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/mamojixudutel.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/70696092970.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/tuwagivinulikopifotageni.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/20305823637.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/kezesetegegizij.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/fizasoponuzutipitefilobuk.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/44324596448.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/bodajuvawa.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/20907029486.pdfIn PDF document text
    • https://somogyplusz.hu/files/naturadikuvefomafavero.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/kamosirutimibo.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/11670088334.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_off0000b0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CA 17044 bytes
SHA-256: c7cc25fea8de3311e774d166be9612afc08ac2c89abcd3e2cc60f53071799a91
font_02_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 10416 bytes
SHA-256: ce6872ab48b76d99f5f2192b326a5a48b5072ebe93b1e6e3d66302dc7d82c3b1