Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b30c42304d0b91…

MALICIOUS

PDF

73.0 KB Created: 2021-09-10 07:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea8ba54c44036e042154d1acaf907131 SHA-1: dca55b68ddc059fba747376865f8bad3c8755f16 SHA-256: e2b30c42304d0b91b9089f9229b456823446f2eb5c4ae93419cf4042460a520c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic identified it as a link farm. The primary purpose appears to be directing users to a collection of potentially malicious PDFs hosted across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://boek.se/bilder_umeny/File/97747843192.pdf In PDF document text
    • https://akapacha.com/userfiles/file/ruxotuv.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/49302867837.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/wuxavawofujalijubafok.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/538868692.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/sifesawobibenuveta.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/90464803211.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/56848278404.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/kebunumidubexuwaduxava.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/fepotijojugopabimim.pdfIn PDF document text
    • http://bdn10.cz/files/file/wezatawatunile.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/wiwizamugipugiposurapo.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/zipemagikijitazo.pdfIn PDF document text
    • https://geloracinta.com/contents/files/zelos.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/43945417186.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/dobujomexabifimob.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/nofiwubabamizulezebog.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e3d616230f98b9306e8b01bc04534b60/ritagedera.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/xaronibiruralejexilefufan.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/vogesevigitefufif.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/31328284139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fnac+1+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67F 14892 bytes
SHA-256: 654ec06d68865e66abcc2b9be1c5e64aa2ef242405b601397923d03d9b62f119
font_02_sfnt_off0000eab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 9948 bytes
SHA-256: 61691450cf98b4eb18f5b9de50ebb821e08f209fe5340260594ace485f62a220
font_03_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1

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