Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec4762872b36452…

MALICIOUS

PDF

75.6 KB Created: 2021-09-09 14:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 115d057f64a9863c4e3cf052c1c43c0d SHA-1: 3c0102d1380fae4de2d27f72c6c67f43a23c1fff SHA-256: 6ec4762872b3645209ca8123e328b11b3c6d05768a197679a285a6c6d4634da7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=bifrost+cloud+gaming+mod+apk+download PDF link annotation
    • http://nexxstep.nl/userfiles/file/36947244651.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/63661597093.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/mepinowuwojudidamupod.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/23177857151.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/zokoxivesek.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/gebenajedexu.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/nidurupokugositono.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/mijamujorupuwurojeko.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/pamizelokojewowimujupaf.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/sofunamunusegip.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/16761058429.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161354508b8a87---xexaxojoveludeketikefub.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/degakuxezibutipu.pdfIn PDF document text
    • https://mkart.it/uploads/file/92901921021.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///rurilitovadamino.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/dabifomu.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/bowasaz.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/zibowugutenefeju.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/gozapizidisenetiw.pdfIn PDF document text
    • https://resicolor.com/upload/files/rufijadukovogumovupus.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/fisujawanipetuzavitazurux.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210903184745_adafrl.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/fitemosijus.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1852c7ce6bcb699af280e1e249b3b4df/65930865869.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/4400429489.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/jotigewimolufelunu.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_off0000bf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 11164 bytes
SHA-256: 43ec2b1876a3d1893dd2abf437bf085fa43c25132cb30ed9b10eed6d43a27c7c
font_02_sfnt_off0000f15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15D 18552 bytes
SHA-256: 248d5055d924f869f3c5ae58475a2570c57ebd508cacd024729c6a81eb7abf44