Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d9a8378828127e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 01:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 51726faf56c8e7878f5802628ee3292b SHA-1: 30c3add4545fef267b98a803d8fda38a9e63c9da SHA-256: b9d9a8378828127edc59e6f5bba9d444118b7654ca2b4dbad7e1e63954faf1de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this as a tactic to distribute content across many domains. While no scripts were extracted, the structure and URL patterns suggest a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://elitaliaweb.it/upload/file/9171897891.pdf In PDF document text
    • https://toppelletmachine.com/d/files/75626841941.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e763e8ff3e---livuzubumosafedifanejipal.pdfIn PDF document text
    • https://europartner2.pl/uploads/8544920076.pdfIn PDF document text
    • http://synowka.pl/galeria/file/27734479360.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/96124591353.pdfIn PDF document text
    • http://mfahk.com/upload/files/virasurileleluresenixek.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/63205005324.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/tevusan.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/9267740445.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/95716300892.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/24712439694.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/tejewuxut.pdfIn PDF document text
    • https://equimat-cheval.fr/file/wanavat.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/88368105290.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/wisorotubokawusulonemosok.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/mafuxonup.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/19830441906.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/73502897653.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/mowazisopa.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/lajubijusawini.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/wuzarokop.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/21728736961.pdfIn PDF document text
    • https://samowar.ch/upload/file/95266431895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=streamer+life+simulator+apk+modPDF 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_off0000d271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD271 16768 bytes
SHA-256: 7befdf351567a24814ea47b9316565bd354dd66b6a911a6b04ea4d17b992aede
font_01_sfnt_off0000fd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 10820 bytes
SHA-256: 83a2cc4e1673da4c13d8906601484ee267f074f50aef2b8d9401989547b21051
font_02_sfnt_off00011682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1