Malicious PDF — malware analysis report

Static analysis result for SHA-256 44295c19dc279afd…

MALICIOUS

PDF

79.4 KB Created: 2021-09-11 07:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f92fe1adb98ac6b364bbc5c9cff4c1b SHA-1: f0d91d170b747d9e845f0b4b31a1ef5006fc72b5 SHA-256: 44295c19dc279afdfd755d2fbc9474f84d3f9f61aa4c4bfd5fe97bf5aa45b874
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, despite some being marked benign, point to a pattern of hosting potentially malicious content. The document body is heavily obfuscated, but the overall structure and heuristic firings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://kleinschadenexperte.de/userfiles/file/80488319354.pdf In PDF document text
    • http://anthonyvienna.com/sites/default/files/file/tajojesowa.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/21090113520646062082je89.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/11475733084.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/40625948715.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/9805299849.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/75979701991.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/dunafixajezomilapefu.pdfIn PDF document text
    • https://computerzone.pk/file/kinixewajuzomaros.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/fuvokadekozosunasuridur.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa5689548---ridojadanitalitorabe.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/vibekolek.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/setogadafulodobiwevijuw.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/46484931845.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/73468629261.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/92045005818.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/dafilusesagefibawijirowux.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/banulukogezamo.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/xuvawep.pdfIn PDF document text
    • http://webs123.com/userfiles/file/vonowapomogasav.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/rawavopox.pdfIn PDF document text
    • http://honghuibio.com/d/files/11914411228.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/guxonazewovuforubikoz.pdfIn PDF document text
    • https://activepymes.com/pub/file/kizidibeluzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mobile+gba+emulatorPDF 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_off0000d2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E6 17428 bytes
SHA-256: f9127985377e5dcf350f911dfa73d63cff2ad844d8cd3b573f57b6eb14d19b4a
font_01_sfnt_off00010050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10050 10412 bytes
SHA-256: 73483dc2704f528c90df9c61def23c3c137b57d48e25f521ae470c239fcd19e5
font_02_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1