Malicious PDF — malware analysis report

Static analysis result for SHA-256 94927951f4b6f7cc…

MALICIOUS

PDF

77.3 KB Created: 2021-09-20 01:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b69601046fca4ec7becca725a7238b8e SHA-1: 256bfef7e94c848f706abbc2d0b42ef9a4799930 SHA-256: 94927951f4b6f7cc17c51537ea1695924df1d20fbcc9343977175370d4443ae6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. Heuristics indicate the PDF contains a large number of external URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://stgeorgedentalcare.in/ckfinder/userfiles/files/86025978295.pdf In PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132db7980132---papojafo.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/lovafifomizefakifaxox.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/disipokoxezosirukazapazix.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/xiruvebiwomanamemiribo.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/67945522460.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/75378571176.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/lobawevos.pdfIn PDF document text
    • http://sireny.net/share/files/16952314445.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/vuxata.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/zigalagube.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/vozufudadofonofuwid.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/vexakajifagegapuganegusog.pdfIn PDF document text
    • http://ceroki.com/image/files/gujopuw.pdfIn PDF document text
    • http://xaydunganphubacninh.com/webroot/img/files/27662840031.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/26765836861.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/dajamik.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/41382987660.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/bakukofagamu.pdfIn PDF document text
    • http://e-sportis.com/images/upload/5412806437.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/54072613984.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/56392642778.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/22684457904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=avatar+legacy+pdfPDF 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_off0000c9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CE 17584 bytes
SHA-256: a701cbfaae2aa9aa023c404194ca7b9007b1e844c510360126ebeddc12b85d61
font_01_sfnt_off0000f7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 10472 bytes
SHA-256: 2c0d2ce6a63b8229ddd1cfb419c68fdaf75d928dfc16caf92937af999643b805
font_02_sfnt_off00010f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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