Malicious PDF — malware analysis report

Static analysis result for SHA-256 4513ae7c061c7deb…

MALICIOUS

PDF

80.9 KB Created: 2021-09-11 20:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: fa1af23b08531c17b4513d4836aac913 SHA-1: 59d98a4d5315a75d2a977c76cb84ee18a9a9c519 SHA-256: 4513ae7c061c7debc2d5ceda5f70783b2113b14767cfc540fdce7befd8290388
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=21+con+40+full+movie+online PDF link annotation
    • http://agriturismolescuderie.eu/userfiles/files/90969879844.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109051937065714.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109081447025950.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/98048756643.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/35681058870.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/wujuxaberolasexolebojal.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/44539026172.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/bivijuvugifuxiju.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/66816327169.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/17248372.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/65176658175.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210905142802.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/78116020525.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/61179988899.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/96536821709.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/42425790061.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631348021.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/valesefebosutuve.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210906172741.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/vibowujot.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/19256237068.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/84841788989.pdfIn PDF document text
    • 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_off0000d7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A4 18188 bytes
SHA-256: 6c00a1ee1b22c2781dbfd70e43f25f110ab0851b98b683c0206b98757c4a1ea3
font_01_sfnt_off00010677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 10412 bytes
SHA-256: 1fd14606a4571a6deceddd528b7a628d4c9acb51ebb5c9f9ee2caa0d24a18425

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