Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff19490029dd7f6…

MALICIOUS

PDF

87.4 KB Created: 2021-09-15 22:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a4ac9ecc37f6f242163a794b81887c9 SHA-1: 6bc4428b75b68ec8fe7b3885cf881f4cfb25e163 SHA-256: 0ff19490029dd7f6104785da534e89ef763f07c562d38bbf3fb565cb00b097e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, including one pointing to a raw IP address, indicative of malicious activity. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to host a large number of links on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.gyndoktors.de/ckfinder/userfiles/files/7094651316.pdf In PDF document text
    • http://positiveforce.in/uploads/files/21884806482.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/wikitiwitepetamew.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/rimetenujaxemisuwifavemi.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/sazoriwen.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/10525575601.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/sowabipupabuxidam.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/karozi.pdfIn PDF document text
    • http://erictex.com/ufiles/files/48517660693.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141804cbef2a---ripovumupesaragokame.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/dabotuwafuteporetigojewer.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/63517568040.pdfIn PDF document text
    • http://gtshotel.it/images/file/bibaluji.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/towobax.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136f62120fb6---9129009694.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/93505115125.pdfPDF link annotation
    • http://shahgrp.com/uploads/nimowumalazef.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210901133244.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/3719005177.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/kiwagotoderuxesovuzuk.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/28638751007.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/86476546995.pdfIn PDF document text
    • https://tcremich.lu/files/files/buvelu.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109100950213029.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/kalizemeraruvalirid.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/57551779204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+use+of+nfc+in+mobilePDF 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_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 18028 bytes
SHA-256: b80165e83c9639153c667a3634aa7fd5b28850e5b2882ee0d35e1b4717318b7e
font_01_sfnt_off00011f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001372e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372E 10732 bytes
SHA-256: 76724875ee4349f7b6bd4150255de8ae5e031de06e43ea08451148e8c419ee6f