Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8aac833e8ad001…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 10:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25f55ee19fb0d9c49c33fa5bae2f5aa4 SHA-1: bf311036cb8d73af3c66030a4ffaa2f967f42dac SHA-256: 6b8aac833e8ad001a8372a538a04e2926393b7f99a031617467e01eabb8a605a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=the+conjuring+3+123movies PDF link annotation
    • https://atcotourismtravel.com/userfiles/file/27862352108.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/17919235902.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/13903331322.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/89745056354.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/79571670644.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/bakafusivanuwasenu.pdfIn PDF document text
    • http://pjteam.hu/uploads/fuwipupijevesuluwixedotip.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/tolabo.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/mitajaxogari.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/jixofafinilaxobutewepaw.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/54195600799.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/wajezezidaputawixe.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c7179034a---26183452669.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/69058285790.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/fdff07.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/70958147314.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/xavedolo.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161429e2bf2c03---77477570321.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/97867822382.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/rosepeduxabad.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/dafulawegomakufawo.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/jujepozilororasubimex.pdfIn PDF document text
    • http://intertravel.hu/_user/file/sovowelitulesaxakupo.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/89499528463.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_off0000bd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD09 18164 bytes
SHA-256: e80ceaa3ea7cf174cbeed4eccea1a82983d278459a6dc6eecf621e208fbba345
font_01_sfnt_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 10972 bytes
SHA-256: b5799fc0624f3a0b87d1390623e78d2390de0538bb1deb235948db5073b4d7f5
font_02_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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