Malicious PDF — malware analysis report

Static analysis result for SHA-256 15777430abef0fd3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 18:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b6f152928e7129c8af26899a320a3380 SHA-1: 1f6cf54525ed40646e616a7ab57ea631912caa9a SHA-256: 15777430abef0fd30a4cef31e98b0adcdfcfb32ce188b48f655a569036533c67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://oniceh.ru/uplcv?utm_term=which+gfx+tool+is+best+for+free+fire PDF link annotation
    • https://slide-bearing.com/d/files/nowevefumedono.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/tilidivolizifoxesaxo.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/27220437434.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/86322780937.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/bs3oo9lkss2g9dottta660orf0/jesitamatulosawekafuxiri.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/24580408212.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/birofedovavibisodiwilerim.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/xemisegerami.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/89757301782.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/59247034038.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/77080854785.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/bimapenipawowifavo.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/pufavazed.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/zolukor.pdfIn PDF document text
    • http://villkasz.hu/editor_up/83071523142.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021951931353607.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/8763732519.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/kotinulajubo.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/49081810694.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/sofodawafixumasa.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/rubema.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/34003289829.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/suvazimumefotutipubuva.pdfIn PDF document text
    • http://partnercable.com/files/denasigazo.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/75351107844.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/gozidozaje.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_off0000daec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 17464 bytes
SHA-256: 11984e015170f9d0660b0cc5afefdd4b0c9afb173bed55ddc4b96bc5203dca12
font_02_sfnt_off00012084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 10584 bytes
SHA-256: 329869e3c2289a94352e6e0ef059a15d160f5b223b2afedee6ba7626fe227575

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