Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41bdd1fabc0d6ad…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 03:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1384a66b0398282afc2329d5dc6ac644 SHA-1: abbef42573d0d6bf4534e1dfcd618ce52a303322 SHA-256: f41bdd1fabc0d6ad424535b4619c5f56418ae7ed149a53a34a3d2a1d5a33dd11
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying a pattern of disposable hosting for link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=dream+league+hack+2020+apk+download PDF link annotation
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/padufosipiforetexolato.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/wibewufulewiwugofu.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/loxofuda.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/vawane.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/fexofemuwisamud.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/lajetubejaj.pdfIn PDF document text
    • https://webaruhaz.solar-napkollektor.hu/js/ckfinder/userfiles/files/zulotefafakasonizegegak.pdfIn PDF document text
    • http://saaretravel.ee/images/file/biwosatemowujebudawizezej.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/gomituxatobujorovivazeru.pdfIn PDF document text
    • http://wsm.hk/images/files/57830647479.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/74187855554.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/4d3u8i4qru8krh3iq1a7tleec5/sivisolag.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69507144658.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/36829855838.pdfIn PDF document text
    • http://rogatka.osieczna.eu/userfiles/file/jidesijemenujenemutewa.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/wulenowose.pdfIn PDF document text
    • http://humanlitech.com/files/files/73915109338.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/60258641765.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/poxuvetarinutusewo.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/70613399670.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/towamotiluzuwovup.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/86871925457.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_off0000af2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2A 11124 bytes
SHA-256: cdf4e70c4112cdc5b65d8d9f1659f7cadfc5bf2526cae4c62eceee98876b8092
font_01_sfnt_off0000c8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D1 17312 bytes
SHA-256: eed3fdd9fe1f90e0ac343560c1509e4eed8c50cfab9e35d4e9c7e33c78f638dc
font_02_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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