Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73db7ac88c27ad4…

MALICIOUS

PDF

72.0 KB Created: 2021-09-10 04:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51d77f4b57821ecaa6c3daaa1c606b97 SHA-1: 96a9c3e8ae25eaee8030085534353a742714bb8a SHA-256: d73db7ac88c27ad46ffd66c5f9ab89e999fbb6f7310a3b7376645c73e8f9ef4f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The embedded links likely lead to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • 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 http://mtt-association.fr/upload/file/nowesedakidinija.pdf In PDF document text
    • https://carrieres-pierre.com/userfiles/file/kipatitagu.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/bagaf.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/riwalubezebadunuren.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/31189269363.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/67170712826.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/wopadadawufuxotap.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57792196137.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/70731601171.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/xegeduj.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/19282295483.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/wadejezij.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/99330367198.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/84924001824.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/lafigumotuvesijavi.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/68140267657.pdfIn PDF document text
    • https://kiptep.ru/file/jorilekuzebijawuzug.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/15722882391.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/narapuvazugazinizexezef.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/38321967260.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2432c08d---noroluwuvodenowibenixapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=lineage+os+supported+devicesPDF 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_off0000b8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A1 10764 bytes
SHA-256: c1205695dc31459d423664e6b3510473aae0160737e554ae6933b68ce6bfb69a
font_01_sfnt_off0000d15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15B 16092 bytes
SHA-256: f410e3a673ab8c094077af95dc83e258d21872fa8a4579f0dac5eabcf55e69a4
font_02_sfnt_off0000fa8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1