Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc20113f8b215924…

MALICIOUS

PDF

74.8 KB Created: 2021-09-11 11:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 814cee4894032ce1d37f84fce9bedcd8 SHA-1: b13c52ff7d27a262ea50a28e49cf55cf9f36fe0f SHA-256: dc20113f8b215924859e9e59e5b3c214d36fe59899891c7ccac041791ac7004a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including random and disposable URLs designed to lead users to download further malicious content. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used as a lure to distribute malware. No scripts were extracted, but the presence of external links points to a downloader or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://flirdining.com/uploads/files/texazusapaselututoba.pdf In PDF document text
    • http://sgo-bage.com/public/files/files/5401712697.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/futipipelibube.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/21144010051.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090619192170554.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/enb90la958va62l1qn0pvl86pq/vofuwijebakexolagul.pdfIn PDF document text
    • http://sro52.ru/uploads/files/49783959671.pdfIn PDF document text
    • https://chineseclothingonline.com/File/tufijanigirabagoxusupawa.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/78638319030.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/gudopofe.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/movoruwekubo.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/wiribofe.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa8ba7ccb---suzonokififisi.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/72134276934.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/6537277302.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/60863531530.pdfIn PDF document text
    • https://mkontroll.hu/File/getebufekaxufizizewilobi.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/mezefajamupari.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/42171885356.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/34860404406.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/74120440758.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/46311175178.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/7f94d571f268df80e8fe6e4328ea41c0.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+hitman%27s+bodyguard+putlockerPDF 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_off0000baf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF3 18704 bytes
SHA-256: bd7d382cafe91a1ee01d2b62751a0b93b364b5a253b639f0b36e3f578a37f401
font_01_sfnt_off0000eb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 11404 bytes
SHA-256: 91d108f311122f50d6911eba93629ab31f9e3b5ab57b0c794df19f829da0a9fa
font_02_sfnt_off0001059d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1