Malicious PDF — malware analysis report

Static analysis result for SHA-256 77514544ad94f48e…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 18:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bf91df3b14aa57840e99fc75ea502265 SHA-1: d36f2ff74310f5d704912018d5b382f193c75ec0 SHA-256: 77514544ad94f48ef31334e03bed2622a6e84f83e631593086adbd4ea5c0c959
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains heuristics indicating it's a link farm and a lure for browser extension installation. While no scripts were directly extracted, the presence of numerous external URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=smartphone+as+webcam+mac PDF link annotation
    • http://maremio.ru/admin/ckfinder/userfiles/files/ditomeduv.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/50469535971.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/11822968139.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141e23717906---paxifojeja.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/73955857582.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/jedazalirovuj.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/12990234749.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4dd10def80f3aa46055dc748bfaade74/luwijora.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/15703872520.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/vifawutur.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/kegajujavafak.pdfIn PDF document text
    • http://synphabase.ch/upload/file/59848241013.pdfIn PDF document text
    • https://grnca.org/img/files/files/kiwiliburazenoxikokuno.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/fatuzivirun.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/91014719505.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/25282339934.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/depudovibem.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/95265236502.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/xajibagowaziwosemaruvisi.pdfIn PDF document text
    • http://etnorom.hu/pictures/39398668760.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/pipize.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/14087629495.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/95719210690.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/56300736186.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/defibemugezujuvunaliloko.pdfIn PDF document text
    • https://geniodelweb.com/file/49972611071.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_off0000b46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46C 17308 bytes
SHA-256: dbb8cf123b799b33f0ab30c88bbfff9d80b7d07e20c00b51faa38f0917451d02
font_01_sfnt_off0000e096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 10804 bytes
SHA-256: 20d057fbc25a63b74a6b9ea61ebff76a0630b4dfb3e015b1ef446ee2961844dc