Malicious PDF — malware analysis report

Static analysis result for SHA-256 598be5c84a4c3161…

MALICIOUS

PDF

72.1 KB Created: 2021-09-24 22:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4646caf7f4d133f66f6f814e4ce51a7e SHA-1: 083c196feec26f49d8260bf0399d07163f180e60 SHA-256: 598be5c84a4c316196033d946bf10064c09e7934dda912075016b99381d3bd6a
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting an attempt to obscure the final destination or distribute malicious content. The presence of multiple unknown URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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 http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9a943d2c4---67885216453.pdf
    • http://superazs.ru/images/news/file/lixojofi.pdf
    • https://sonerofset.com/userfiles/file/83763055171.pdf
    • http://pathtojanna.com/userfiles/files/57985728926.pdf
    • https://gogift-it.com/userfiles/files/kuwujodefizegonak.pdf
    • http://kietminhrivet.com/upload/files/lakupekat.pdf
    • https://holocaustresearch.pl/nowy/photo/file/vazuwofovutoxel.pdf
    • https://btsis.com/upload/ckfinder/files/41258963166.pdf
    • http://dga.gr/ILC/img/file/7884747866.pdf
    • http://katyababash.com/images/uploads/file/36074422692.pdf
    • http://qlinairnv.be/userfiles/file/8338934723.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613653f1566fe---buvotowiwojumuvavi.pdf
    • https://ctapigroup3.com/contents/files/41369822247.pdf
    • http://pc580.cn/upload_fck/file/2021-9-3/20210903225943740464.pdf
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/23663818537.pdf
    • http://atya.eu/files/file/beludixawote.pdf
    • http://simoncaulkin.com/images/23258167669.pdf
    • http://www.extramas.com/userfiles/files/63327285554.pdf
    • http://abdon.madteam.net/ckfinder/userfiles/files/momurodudezolanawalekek.pdf
    • http://studioriggio.it/userfiles/files/51186903272.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/bokatapot.pdf
    • https://gdwtechnology.com/fckeditor/file/
    • http://recuva.kr/upload/fck_img/1631751511/file/manotokonefugajebesukobig.pdf
    • http://kwiatmetal.pl/userfiles/file/ziredesigus.pdf
    • https://kimcert.net/E/file/genurugemanufodulutufafu.pdf
    • http://albertf.madteam.net/ckfinder/userfiles/files/22276086613.pdf
    • https://fpcofmacon.com/nbloom/fckuploads/file/gakupadem.pdf
    • https://farmaciasacoor.com/site/upload/file/bavigijab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=redmi+note+5+pro+android+update
    • 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_off0000b611.bin
b1c774c662f478b5fabe78fe23ec574bf07c6e41646cb6c495d5d4d1aa1ed197		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB611 10616 bytes
font_01_sfnt_off0000ce52.bin
47ba1b4f467558ab5b9ccf95f5f25651c2f326c8095f30ef4c206314a7130472		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 17084 bytes
font_02_sfnt_off0000fa30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 16792 bytes

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