Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2f45201453b69c…

MALICIOUS

PDF

87.3 KB Created: 2021-09-16 10:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 282feb91a70a42596a929fcf257a716d SHA-1: 8159d1fb523043cf60d4d4c96e2ca8945dd01521 SHA-256: 4a2f45201453b69c68a14d034cbf82a918baf102f34c7dc5546d91eee3de2c17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to external resources that could host malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous disposable hosts for links, further suggesting a malicious intent to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 http://ccsilver.kr/files/fckeditor/file/13128512096131a52e82c7a.pdf In PDF document text
    • http://ledseoul.com/userData/board/file/dopivutegovuki.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/71948285353.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/sifutonitafu.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/78292123903.pdfIn PDF document text
    • https://phnews.ro/files/file/55405513255.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/lalajelikofunew.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/62513832428.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/tetopoz.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/pujoromu.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/67001427496.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbfb7bfea9---tesapasotupajubusugefaz.pdfIn PDF document text
    • http://voijin.com/userfiles/files/66977546634.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/31349291148.pdfIn PDF document text
    • http://synfarm.com/upload/files/61755109677.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/88147105431.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/xesewotasenoguwimatosigen.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091101351711.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/73429820239.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/nirijelurajapazedi.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/14795209804.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/rofubisaxuba.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/1831710856.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///xowiluninutixijuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=indesign+export+failure+background+taskPDF 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_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 11180 bytes
SHA-256: 0b93477bac6a84347b891065fe69ecbc17d866293c15c2bebe38274712bedbca
font_01_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 17524 bytes
SHA-256: cdce8e3f958388d7cecca7823f5776dbde1e88bd1b0232335e5f89f17475184a
font_02_sfnt_off0001359d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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