Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6205df6df019c7…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 02:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf4e007884962553673725709d7738ac SHA-1: e598023b1c5914e3cb3848d3bd57b064cbf757da SHA-256: 7c6205df6df019c7048c775d1ce5e141be433c5dcff4363b5202d0c8ff367699
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dhf-china.com/d/files/73638988639.pdf In PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/70774904681.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/depaxor.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/33494677316.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/ritogesijuvegukugire.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/69817766942.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/35676944717.pdfIn PDF document text
    • http://northcity.rs/slike/files/50250965957.pdfIn PDF document text
    • http://keacg.com/upload/files/58550661069.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/disali.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/ledugedotawu.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/31091573818.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/2555609634.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/83675908131.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/falutukazuxurugugeduf.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/52892224980.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16133c247ef0ad---42827768045.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/20796204389.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/36232065403.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/94f4e4e8fe1f658661137879f0ea4456/gatunawizezodupajifafasu.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/80630178162.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/kuwujotafiw.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/36568011489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hack+fortnite+ps4+aimbotPDF 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_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 18308 bytes
SHA-256: ae61946a87a23d10b71ef03c7fa722d810a1f43e80d3224e6c66f519db751733
font_01_sfnt_off00010915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10915 10896 bytes
SHA-256: 296a7d5028761c7299c11d78f79ae93752480cf30101bbff2303fdcf3c52c47f
font_02_sfnt_off00012222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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