Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b25385d6671c015…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 21:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4941706e4587560627918b929851f609 SHA-1: 1ddb88a2fb0e1f0d8e550b1f7f5089bda41c099b SHA-256: 0b25385d6671c015bd67ce8ae522370f09d68d1ba3a362d4a3e4e9746dd040f3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, many hosted on potentially disposable domains, further indicates a phishing or malicious content delivery attempt. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613340d5686a3---22300141025.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210906080046.pdf
    • https://asi-filter.pl/files/file/10856754830.pdf
    • http://ugrctrani.it/userfiles/files/44947389776.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133c9b79d6a0---wuloredir.pdf
    • https://kheops-so.fr/ckfinder/userfiles/files/gopasegosov.pdf
    • http://jrpst.pl/userfiles/file/72613756992.pdf
    • http://quiltingacademy.com/fckeditor/userfiles/file/96011305.pdf
    • https://netiko.ge/img/Data/file/29331344544.pdf
    • http://illinoislivestock.org/userfiles/file/81302373134.pdf
    • http://luisacortesearchitetto.it/userfiles/files/xajedadazov.pdf
    • http://semanbio.com/upload/files/99200284327.pdf
    • https://matfplayer.com/calisma2/files/uploads/37240106149.pdf
    • http://dakov.hu/_user/file/fenuzif.pdf
    • http://daieimotors.com/js/upload/files/zobir.pdf
    • http://hanlacsclub.com/ckupload/files/jipek.pdf
    • http://heimundsicherheit.de/userfiles/file/levifos.pdf
    • https://mimpishio2bet.com/contents/files/reratapalabipafiju.pdf
    • https://cabsfromheathrow.com/userfiles/file/72781831789.pdf
    • http://secondhandgraphics.com/usrfiles/file/85453896721.pdf
    • https://laatuwhuisweerstralen.nl/upload/file/fitaximuve.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/vosilapagogifonalosiloza.pdf
    • http://hstechno.com/userData/ebizro_board/file/7845243128.pdf
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/87464432890.pdf
    • https://erdemlerkoleji.com/resimler/files/xufonulofoge.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=reading+comprehension+about+travelling+around+the+world+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 16792 bytes
font_01_sfnt_off0000f219.bin
c39ca7527c90d569cb34a1a5f5dd119ecae1449f5b68931211582686ce1ba21a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 18244 bytes
font_02_sfnt_off00012181.bin
251b6561851929146a6123e1ec424c48c196cab8309bd4a480faa0db79cb7727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 11504 bytes

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