Malicious PDF — malware analysis report

Static analysis result for SHA-256 08047b19dfb7ddd6…

MALICIOUS

PDF

72.4 KB Created: 2021-10-09 01:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1254bf6db390da2ffef19df120703e9 SHA-1: 2aafa1c973c71db2538ad69d6c41c60aceadf507 SHA-256: 08047b19dfb7ddd6897ed73fcbd3e7dc1982f0d22cae515f3903a60d0e92ad9e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of external URIs and the overall structure suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://huntic.ru/uplcv?utm_term=personal+qualities+to+become+a+good+teacher
    • http://www.kevimotor-rock.hu/files/files/berefukelazebarigosubis.pdf
    • http://status.cz/UserFiles/File/tedelakudozudire.pdf
    • http://wmasgroup.com/userfiles/file/zixut.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/186510fe187ef65c49f05943f223937c/20270483263.pdf
    • http://orkoien.com/userfiles/files/30698271899.pdf
    • http://ketex.com/trcgp/ckfinder/userfiles/files/35913032606.pdf
    • http://www.ciesol.com/ckfinder/userfiles/files/78289479546.pdf
    • https://mabuksusu2.com/contents/files/japat.pdf
    • http://ilturismoinitalia.it/userfiles/files/58225652336.pdf
    • http://gelikonline.ru/content/Files/47688123209.pdf
    • https://lideregitimpaketleri.com/calisma2/files/uploads/tifofaresut.pdf
    • http://alexlunacoach.com/img/editor/file/47685601827.pdf
    • http://onmamtour.com/FileData/ckfinder/files/20210922_DB8A66C14BF57FB8.pdf
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/babejazabu.pdf
    • http://moutierrozeille.fr/userfiles/file/fanavifi.pdf
    • http://angerdress.store/ckfinder/userfiles/files/56898398088.pdf
    • http://ufcnagykanizsa.hu/userfiles/file/1180510352.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e7179decd5e5e9990547087b5ff7c795/xuvigi.pdf
    • http://rinsacars.com/files/others/56423042619.pdf
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/31970746923.pdf
    • http://teusz.pl/UserFiles/file/xasekenupodij.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000bb21.bin
7d3b1511b0bf6b354d8b96e1f4f602b51b8082015b083e9f55955ccc2a0d2535		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB21 11204 bytes
font_01_sfnt_off0000d4ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AE 16792 bytes
font_02_sfnt_off0000ecc0.bin
c698b19f97c9ea0ba8714628674296b2fc117afc5a6a12faa883c73f79b48a94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 15684 bytes

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