Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2cd3fc3101a56f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 22:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2ccca89c875e4f882be34ce17dc2bf7 SHA-1: ab6e1ee9c4fa03fff18deed1acef2e6bec29a2d0 SHA-256: ec2cd3fc3101a56fd19ec6140348fddc3dba7c2b7667f1e2e4257dc44ae1f0ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs, many of which point to disposable hosting and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of embedded URLs and the link farm structure suggest the document is designed to redirect users to malicious sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://drafthe.ru/uplcv?utm_term=minecraft+pe+apk+with+multiplayer PDF link annotation
    • http://moyamoya.center/images/hand_uploaded/files/sotevopufutevewojuwes.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae102a398---zemotukas.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/bemafujewuwunufiw.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210904070248.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/sumaram.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/xonasozot.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161361b439df7d---38103617863.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/jasewigovefi.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/vaxoxame.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/88788846849.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/piwomitevuxugulupusegi.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/kuxenidote.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/renevomurefizanekado.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/ganewezinawinesituzozud.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/63780635735.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/9921695442.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/jukavazifadope.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/baxifi.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210908035159.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/jivufijumubasimolado.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/84661330145.pdfIn PDF document text
    • http://actinq.nl/upload/file/regigozuwugiraxekudo.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/86773120424.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/95538065355.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_off0000cf7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 10840 bytes
SHA-256: 1e96b4d20b00b2b3bb32cd1014044c4f058be8384bf71f7a3b2df3ad18cad6a6
font_02_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 19804 bytes
SHA-256: c7b1cadca1a4bbda9e221b352078b9ac9f56c1b2eb2c796b2d8b33036b7324ca