Malicious PDF — malware analysis report

Static analysis result for SHA-256 8093da532c6f3e77…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 00:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 311d3e7f5048308d43ad676872185343 SHA-1: 68957b3f5545450a9ef1e7c140951951b299b8a4 SHA-256: 8093da532c6f3e77a165c50be0fb10fac70c72e048901e1f7e407ca471747868
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it is a link farm on disposable hosting. The PDF contains numerous external URIs pointing to suspicious domains, suggesting it's used to redirect users to malicious content. No scripts were extracted, but the PDF structure and URI findings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://pixomot.ru/uplcv?utm_term=kula+world+for+android PDF link annotation
    • http://elencostruzioni.it/userfiles/files/zerumamiguxutoduwalutuf.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/28146500857.pdfIn PDF document text
    • http://idcla.net/upload/files/89021422654.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/pomubomijo.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/1993633089.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/83021668191.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/26835255301.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/rofepusazug.pdfIn PDF document text
    • https://chineseclothingonline.com/File/tufijanigirabagoxusupawa.pdfIn PDF document text
    • http://gugugroup.com/userfiles/foleximojopokig.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/mavosufemefap.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/95962548135.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/40819686817.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091623090373499.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140821c60823---85276579278.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/3649209560.pdfIn PDF document text
    • http://mlight.cz/archiv/file/tapunovamopagirun.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/gomobawidisumazepib.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210903032648.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/97481135190.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pusomubejabuzaver.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210917001627_68av5j.pdfIn PDF document text
    • https://adikkedua.com/contents/files/jedek.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/vifarolowukekesubenu.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/reromudo.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_off0000d3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 10124 bytes
SHA-256: 026107bdc2460dc0f5c59478e55f82074026ab2393787ceba33b76b0798ddb06
font_02_sfnt_off00010264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10264 19260 bytes
SHA-256: 13974368579d634d4db761200b5d8639c8a00e2c65a488a820447bc0468f20ed

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