Malicious PDF — malware analysis report

Static analysis result for SHA-256 744492fe0bff5d2b…

MALICIOUS

PDF

77.4 KB Created: 2021-09-15 16:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7452ce4c9acf40a97557ed67ebab8ee SHA-1: f90605d298bcb2ec66dc54f1ced4a1f6b296a250 SHA-256: 744492fe0bff5d2be24ee41063febcc2b9bcfcddf8147c3be61c90e26b1a24ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting an attempt to obscure malicious destinations. The presence of embedded URLs points towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pistant.ru/uplcv?utm_term=download+subtitle+the+conjuring+3
    • https://lionkingbali.com/uploads/file/99829976484.pdf
    • http://thuexe7cho.vn/upload/files/fikumevoda.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/71586117440.pdf
    • https://egyptsuntours.com/userfiles/files/54699437632.pdf
    • http://rambud.pl/uploaded/file/nedibulubepizuzam.pdf
    • http://oxigensupplies.com/shipinc/userfiles/files/kubanimasewoset.pdf
    • http://longthinhphat.net/uploads/files/35386604856.pdf
    • https://g4m3s-4p1-12s1.com/contents/files/34161340019.pdf
    • http://futboltotal.net/images/files/25825556808.pdf
    • https://khoahoc.timviec365.com/picturesfiles/linulojukogefupugi.pdf
    • http://otohondamientay.com/upload/files/tafuxupikozidomufor.pdf
    • http://cegled.varosom.hu/userfiles/files/69212487051.pdf
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/82505691624.pdf
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/potoperoxen.pdf
    • http://ellenia3.eu/userfiles/files/wutasapazunudotudol.pdf
    • http://naosgym.com/userfiles/files/29862765257.pdf
    • http://paroissedementon.fr/upload/files/86988707208.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cef5b16e9---lavawagekewapoxibotaj.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72816678891.pdf
    • https://chennothinterios.com/uploads/file/bisuxolesidowaxofupuwu.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210906_231040.pdf
    • http://edilcfcostruzioni.com/userfiles/files/tinijakukokajujesilojowol.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c424.bin
1424753c83ee9cc8432f5bad7aa2c6a6c4f64761c2b7ea9e19c55f1b5bcb8067		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC424 18768 bytes
font_01_sfnt_off0000f5a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 16792 bytes
font_02_sfnt_off00010db9.bin
70ab16807f66e040fbcb728e9c131015c5a3e47cb4da43a980dd63fa973e829e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB9 11276 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.