Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17d052c4e83fb67…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 17:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb8ebdb5f38b16299c3ef0f5505754fb SHA-1: 4deb8542c46e0b90d6ed1b2c6844bfbe117c6595 SHA-256: b17d052c4e83fb675797913f35a4f3f0466b5ea946875a3e69dd8bd754b2f8b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs point to various domains, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://allytemp.ru/uplcv?utm_term=most+installed+android+games PDF link annotation
    • http://www.hebrewforreadingcomprehension.com/content/migad.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/99182324839.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/livuzuserepolusati.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/vuwarumi.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/73954733103.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/tanafufovijopi.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/napol.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/tezokizawerosi.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/65393788570.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/82588556647.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109020621483842.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/db4f942849eb75bc86496ce44c9ea780/70133004966.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/boxerovedilulafapirojeke.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/nilegofugo.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/xalewodexukabenapelixap.pdfIn PDF document text
    • https://ordermorestuff.com/cmsCart/upload/file/xodofexoban.pdfIn PDF document text
    • http://halaljones.com/uploads/files/wixifav.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210912104835_r2cire.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/94973250616.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/rebobawoxobabekaku.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/fewefonifim.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/58985281944.pdfIn PDF document text
    • https://limadelimon.com/images/file/zovutinulijifulewata.pdfIn PDF document text
    • https://onlinendttraining.net/files/14473986023.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/21665471093.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_off0000aeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDA 15816 bytes
SHA-256: fdf5fba31eb02dd2eefb38db0b0488174c237579747b8229df75abf850a49d24
font_01_sfnt_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 10584 bytes
SHA-256: 17efeada65433c4f7615a5d51f5537936857bed6fb2673bd4483dce9de068e02