Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee896d62216feda…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 20:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0e3679a117e052cfbe30c96be7a347a SHA-1: 7aeb608fe8e0a00523bc641f80c38e804acf4dbb SHA-256: cee896d62216feda34d5c8e9393516654030c1eb508b24317bba8f4f0b549884
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to external PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct, potentially disposable hosts for these links, suggesting an attempt to manipulate search engine results or distribute content through a wide network of sites. No scripts were extracted, but the overall structure and detection indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://fitviewer.biz/files/file/69716446821.pdf In PDF document text
    • http://maciejabramowicz.pl/upload/files/file/tavamiwovabaz.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/28527889732.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/muxekozekaxadazixelu.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/wojawaremijemag.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/xalazilewutobonaj.pdfIn PDF document text
    • https://tekartltd.com/upload/files/78323502488.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/42711113242.pdfIn PDF document text
    • http://kasand.com/userfiles/tuzivujorigekaxepinizu.pdfIn PDF document text
    • http://ropesadventure.com/d/files/dodonumanakomuvekovi.pdfIn PDF document text
    • http://benrassam.com/uploads/files/retovarawizapeveg.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/79734785795.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/zarirusopipagurumaren.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/puzibimo.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/zumedupora.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/vulizenasetupebevusev.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/12868696828.pdfIn PDF document text
    • http://4rrecycle.com/files/file/17197366757.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/75355738716.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/27967872376.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/kalani.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/fawato.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d58235727---82051496276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+change+model+name+in+androidPDF 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_off0000d6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 17776 bytes
SHA-256: cf8722e84941078649412c0fd65f15bcc65907529eafd251a02eb675ce3ac383
font_01_sfnt_off00010580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D97 10724 bytes
SHA-256: 84ab6efeaca3822ef332ef966b92663cc132edd60c8046d92330762089214021

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