Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9f2be110175065…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 12:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 33f05808d280e833ae0dfee9a1a66e5d SHA-1: 85411cb7428eed72da214d0d90625b041ad7f884 SHA-256: fd9f2be110175065411e37a51681e6621d65129cd54111f5346ca88f5c65b850
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to suspicious or disposable domains, indicating a likely 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 URLs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=mp3+change+to+mp4 PDF link annotation
    • https://abctranslink.com/ckfinder/userfiles/files/90304554199.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/52778999428.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/9mbvl0mrak56k79cocensrmuiq6tbior/36074821567.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/3617218167.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/dobizewagu.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/rotodozakidesa.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/rixabe.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/45464610438.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/15943054156.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/mufumuzasufazaf.pdfIn PDF document text
    • http://scpt.it/userfiles/files/kefuwaxenujak.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/ziwepijomotib.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/91491878254.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/12421065758.pdfIn PDF document text
    • http://kmimmigrationlaw.com/userfiles/file/7152692356.pdfIn PDF document text
    • https://securitydm.net/slicice/file/93879874017.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/zizeni.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/64398259474.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/gogesatokarikod.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/takegatijigepazimadad.pdfIn PDF document text
    • http://akvarium-olbrecht.cz/upload/file/45016857616.pdfIn PDF document text
    • http://setunari.com/uploads/news/2021/09/22/file/lekalapamososiru.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/18543991018.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/15741116345.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_off0000b10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10C 15340 bytes
SHA-256: 624a1a9a1aa4d313fa57fcdd74db4f70955a48a67438e0628ea985f77217ac00
font_01_sfnt_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 10656 bytes
SHA-256: 81ae7a2740dedcd53b822aa909ccf64e5f124ce8f237b5b1b2e44e45042df257
font_02_sfnt_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1