Malicious PDF — malware analysis report

Static analysis result for SHA-256 311c2ba7fe9a43f1…

MALICIOUS

PDF

74.5 KB Created: 2021-09-12 08:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 23a090cf3b0538767deba3293e485991 SHA-1: bbd55573ef5c9c2c81614846a2ed059eec26d5d2 SHA-256: 311c2ba7fe9a43f13ccb934d141486f01d92210c00a8017ded30116568a77185
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links on potentially disposable domains, a common tactic for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://amandatravel.com/userfiles/file/68858012135.pdf In PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/31174172822.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/gakosulam.pdfIn PDF document text
    • https://thehouseproduction.net/file/watisexu.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/pibivewixubadelow.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/bumevubuwejuni.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/livuv.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/80910381433.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/zadubip.pdfIn PDF document text
    • http://usmleworkout.com/files/file/lesexow.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-10/20210910223720384320.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/50911343941.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1cb8a718---50543295300.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/nupoxutotoxepifaremuz.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/xovijale.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/17201015681.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/xekevogefumifilavezadeb.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16130e0de597a3---16971685443.pdfIn PDF document text
    • http://pi-consulting.ch/download/dedobaxanisisoxijamegodi.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210904_5141B38FC9DFF5AB.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/winoxoxowamuvalov.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/81957057665.pdfIn PDF document text
    • https://dcimx.com/files/84806472024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=effective+chest+workoutPDF 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_off0000c118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC118 16904 bytes
SHA-256: a1c1bb4cee2aff32ac589f715d51b7d863fe906103d98899ea42f9fc627f93fd
font_01_sfnt_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 10448 bytes
SHA-256: 258292d257cbd3598e8164790b23864351a2adda815b384c8b8a1d74f9d1e4bd
font_02_sfnt_off0001044f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.