Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa233d49cde60d7c…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 18:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 713889e2960816e107ddfdb7491c0272 SHA-1: 71eb124c459b2e0f24f83fcb4abd45d705dfe8b7 SHA-256: aa233d49cde60d7c74bd1f6a3c59fbeaa4a9cb5789c731f2906b15491e3d97a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://drafthe.ru/uplcv?utm_term=balaji+tambe+pregnancy+book+pdf+in+marathi PDF link annotation
    • https://fenicia.uy/fenicia.com.uy/uploads/files/tanevelapaguxufona.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/10698256392.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/godepimofoke.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/viluroleboxolugap.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/38093652208.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/11072968463.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/kosafutepemojujewaxe.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/73041507368.pdfIn PDF document text
    • https://profm.hu/files/file/mojadoxotobawupigedifones.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/dagixaxatev.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/18219556202.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/76964310713.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ne6gposjp99a622fatj8bfhuoh/3570356374.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/91202043235.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613935af5d629---forinusederikejikefapejok.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/73684429763.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/wipesupugabu.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/37590987904.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/1960238069.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/39869082063.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631145323_dde5c587a7.pdfIn PDF document text
    • https://8-hi.dataroom.tw/upload/file/kezuvizirutavofesonezotu.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210927081922.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_off0000af34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF34 16856 bytes
SHA-256: 12d9886cba43a6c2e6c4e947fef58d3c652181513e790354415f9ffab721e10c
font_01_sfnt_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 11428 bytes
SHA-256: d12c01597f589ce08109aede024e22b4253529fa96bdbfa5440844d207aeea9a