Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ae6e6e9f0898de…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 09:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d536349a87481c036fe7051e9708148b SHA-1: af719b6fad0148a768bba6a5fc4b637dafd5d742 SHA-256: d3ae6e6e9f0898de0db6a4afa9c355522f6c01ee85f24310035be7f069227cd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs point to PDFs on various domains, suggesting a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://christianklein.eu/Quansis/ckfinder/userfiles/files/texuzuzir.pdf In PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/fesokotedelorupagefikuvef.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/44622112510.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/6415666000.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109110218432493.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/70054925087.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/sabopirade.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/gijedabegebilinonoxaz.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/zaxobabigevulagini.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/gobogevev.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/48333210980.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/kokanum.pdfIn PDF document text
    • http://gro-felix.si/uploads/pusumev.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210920022117_byaxhh.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/hpmadjq9ui2acf257cg0ue48os/57652585823.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/zumomijibozi.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/74386399270.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/lofebofevasijub.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/paronawizifawuvi.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/60962370067.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/62071010758.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613967ed042bb---51716195191.pdfIn PDF document text
    • http://lse.hu/userfiles/file/61755924262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=social+media+content+marketing+pdfPDF 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_off0000b1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F8 10964 bytes
SHA-256: 1e9b63338fb3ddafff2da2e078d5fabbe0cc5b3583f34b7138799aa0ff2e2c7a
font_01_sfnt_off0000cb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 16316 bytes
SHA-256: ae758904f034293cb60082b6f3c1c5d7fa546ec8b7297f503473e3bc1446684f

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