Malicious PDF — malware analysis report

Static analysis result for SHA-256 b989fc83615ec1f2…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 12:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c6e71cf1d57703859145026e868afa66 SHA-1: a05866a1e037bc543e694d966f9d74016973bc57 SHA-256: b989fc83615ec1f217cb00c5a2f13db012996e0df961a40bba459243c84c06ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://csn-alliance.com/data/files/95596917933.pdf In PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/kixofozejuzodenik.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/mopowokiroweg.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210912010724-zevemigaxexife.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/zapaborawejego.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/42758192927.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/15429633816.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/bodezepematu.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/2863824357.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/rozadokibunimuxasub.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132b18f2c01e---23333520186.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/32776541168.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/68140484368.pdfIn PDF document text
    • https://best-label.com/upload/files/58217009475.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/bulesujawelov.pdfIn PDF document text
    • http://mq-water.net/upload/86875528595.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/debowagevutatejaguwokaje.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613da5252a763---kuxagigetaxebemebife.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/65680807594.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/nugijizura.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/wefopilajomilevavofon.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/29034383268.pdfIn PDF document text
    • http://citty.org/images/uploads/file/83220206117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=linux+system+programming+2nd+editionPDF 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_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 11080 bytes
SHA-256: 589c8e49fc6928075be8f6ef6616b2990f6c63aca4e2021d9ce501cfeb0acc33
font_01_sfnt_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11423 17692 bytes
SHA-256: 77e719db94e6fbb69e9517f361e3936744b19433e8d0306b159a6e2d9cc7c95e

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