Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b72af082ea7d0a…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 18:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f98ff597b84e5d38044ca4dc42faff1 SHA-1: d5df710d25befa3ca2e6e6456d52aca12fe7d7a6 SHA-256: 76b72af082ea7d0a6a66b01573aff23dba4950ab993b0fb07dae1f278455e17c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file as a malicious attachment aligns with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=the+legend+of+king+arthur+pdf PDF link annotation
    • http://heninrealty.com/userfiles/files/34310892679.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/11110171769.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/54471570693.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/jipowoguzanibilupuladag.pdfIn PDF document text
    • http://lex.tj/img/file/sugifupevakem.pdfIn PDF document text
    • http://signauction.net/userfiles/file/magefamotububogem.pdfIn PDF document text
    • http://checopharma.com/upload/files/53094962478.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/gujepebagapozebade.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/74062168231.pdfIn PDF document text
    • http://newshop.jp/archive/file/65251328722.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62300156885.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/42067992582.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/c1p4q0jf0meljdpd5sjdlogo91/11007077561.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/47117200150.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/1771461957.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/vijuraxozulesopoz.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/dajadavowupabum.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/6071614293.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/tewudapuwufilafuredot.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/8525474454.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/9387897955.pdfIn PDF document text
    • https://dintek.eu/uploads/file/68304674129.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_off0000b108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB108 10764 bytes
SHA-256: 9e508879a8b7165eb01c6000e891f7d280fb218478954e070547ccec817fd53a
font_01_sfnt_off0000c981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC981 17308 bytes
SHA-256: 731614395dde5d5627bb77553d1363149b633a482aaa3127f4b33969974c4977
font_02_sfnt_off0000f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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