Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37f11af72f621a0…

MALICIOUS

PDF

86.9 KB Created: 2021-09-12 23:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da53873b557263b27e2bbb96e6638dcc SHA-1: 9d87657813e7014c9fd7d1253456135e8524dfa5 SHA-256: f37f11af72f621a079d14d0d5d0f6de25c50b2069c386ecd356b0ea1f3aa19f7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The embedded JavaScript could be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=friends+season+3+episode+2+watch+online PDF link annotation
    • http://tabouligrill.com/ckfinder/userfiles/files/jufipujofafapuxi.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/jikugusepusojijuxem.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210906052401.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/besuvabe.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/61786040531.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/mixopukuvukegiz.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/bazenenuwugisamexatamas.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/pilovipar.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/64222568258.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/79069313735.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/82604062259.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/49292075557.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/sedobazop.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/dakur.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/60822784588.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/84404505697.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109082022014662.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/34912152078.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/6618845956.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/97812545043.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/rn4etsgh5j66hlgs7rmeei1bv9/49222391208.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/52563249649.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/87575739391.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_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 10964 bytes
SHA-256: 3dbf9887af68bdc0cc69e6141785db1bf6ff16991aad343aa99eb437e78b9eaf
font_02_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 18120 bytes
SHA-256: 1c39abeb2ad0f753cfa04675d6c42209cb0047ad0460441aade1c6dcd3aa939c

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