Malicious PDF — malware analysis report

Static analysis result for SHA-256 f333dce2f1868ddc…

MALICIOUS

PDF

70.9 KB Created: 2021-09-09 22:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db10a62e5e75112983a46ff73de6abe5 SHA-1: 20cb7b1086a2313419c5dc409342cb35dbf95fac SHA-256: f333dce2f1868ddcb323aa36ccfb9c091377f73fa2749929d61260b1e25b00c0
134 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. It contains embedded JavaScript and a large number of external URIs, many of which are hosted on potentially disposable domains, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a link farm strategy, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16136f5c00d7f6---talijanexukix.pdf In PDF document text
    • http://melly-incendie.fr/img_db/5232890999.pdfIn PDF document text
    • https://bawauang.com/contents/files/tekakunu.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/12692321589.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/bijotuvelikifubiripixefab.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/gemenubimukifuxotivo.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/86184499561.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/48546717564.pdfIn PDF document text
    • http://grabnerestriche.at/37624848357.pdfIn PDF document text
    • http://foxadv.net/file/juzedor.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/72695479048.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/26605837350.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/738195967.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/82013700299.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/32776251915.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/87909744130.pdfIn PDF document text
    • http://393citizen.com/upload/files/nunifopudepuseno.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///92826710498.pdfIn PDF document text
    • http://medi-sen.com/files/files/34294785415.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354bff0607e---87961544319.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/rewifazikijubu.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/fatemutokanajezuxuzutozu.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/46113426952.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/jitaxugutivaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=find+the+line+integral+with+respect+to+arc+lengthPDF link annotation
    • 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_off0000b588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9A 15280 bytes
SHA-256: 38bf1e60775e6eddbef49dc2859ad79376dad11f97752e568227b375ee4cb942
font_02_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 10856 bytes
SHA-256: 4861bf96edb79ee0b95d2164cf9a5ec86cab0b909798b687c02206a0a09bf8d0