Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf06fd74b6dc101…

MALICIOUS

PDF

78.2 KB Created: 2021-10-19 10:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e456c4dedfe941b01c20643f92dc3f7d SHA-1: 93d6876efc457cc36917ab0ae9bdfc2ccf39549a SHA-256: 5cf06fd74b6dc101626b361da0b668b4650ffd6504ac355e72f8b50db2e7f3a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://daithanhnam.com/upload/files/motevomulavom.pdf In PDF document text
    • http://chatyzvule.cz/uploads/13239776940.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/40344364332.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/xazujizuzeluparop.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/35088135679.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1615fdbf7c0116---92432668984.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/67261341110.pdfIn PDF document text
    • http://soupworld.de/upload/file/85453285212.pdfIn PDF document text
    • http://flexa.cz/docs/file/34631853562.pdfIn PDF document text
    • https://actor-conseil.com/files/file/xitenotevijiwedu.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202110030302353844.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/mijuxexowademirober.pdfIn PDF document text
    • http://terminsk.by/pics/files/57302427730.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/xederesuzemite.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/sigebirigel.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/54033123707.pdfIn PDF document text
    • http://www.cabinet-pollet-lille.fr/img/uploaded/file/41515222076.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/pazoxopadulagubijujarisof.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/83611704662.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9095b1f1edd682f98524671780cf2bc9/97717401093.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/22171373792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/2I9n2o-U8HI/uplcv?utm_term=convert+pdf+to+word+filePDF 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_off0000cfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 16860 bytes
SHA-256: eca5d28ad07cb6eef81f08bb6e8b4d708d7d58dd6f2658c0c2c9e26e097ace30
font_02_sfnt_off000113e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E1 10344 bytes
SHA-256: 78c24b0c2adde2b878ee2e855a2bdee345e0911a59b10c19b43d39c5d995b498

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