Malicious PDF — malware analysis report

Static analysis result for SHA-256 133d0a72eb3cffda…

MALICIOUS

PDF

70.2 KB Created: 2021-09-21 00:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef62685716597cc81ab954721dd98223 SHA-1: 66c71cabb29534846f22f47954bdff1dbe9f2412 SHA-256: 133d0a72eb3cffdadd59ce39d25ec109cd7924e861acce3ac78a5ee0fa1c3809
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a pattern of using disposable hosting for multiple links, reinforcing the phishing/malware distribution hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://maviet.vn/upload/files/17824393495.pdf In PDF document text
    • https://badoza.net/userfiles/file/wovilega.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/75881202975.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc51903af---nufisig.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/37451860227.pdfIn PDF document text
    • http://dytac.hk/userfiles/82052084828.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/zoxope.pdfIn PDF document text
    • http://jn-zhsc.com/upload/76740957926.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/sipuga.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c3637f680336de22469b27c0464e6ef4/248419628.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/fezuwazutakiwuzovu.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/52324681913.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/xijijaronefizawizobafudok.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/zaromibaxojeberiz.pdfIn PDF document text
    • https://wasael.com/userfiles/file/tadafopa.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/32727661852.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/43646317965.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/guferizive.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/40763762825.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/jatefirodanurirobadab.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/57529057333.pdfIn PDF document text
    • https://soechi.net/userfiles/file/sixejaxuk.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/73514329040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+poorest+rich+man+novel+free+onlinePDF 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_off0000b36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7C 15432 bytes
SHA-256: 478ac1a7ee1d9a92054a1f406cb05c92d5289b0f084b5548d51451beb7464bb7
font_02_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 10776 bytes
SHA-256: 9b6873abf06498fbe4659794311cdc158b8e513937fecd5cd3c64a799150145b

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