Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3c748d640a1bf0…

MALICIOUS

PDF

76.7 KB Created: 2021-09-08 18:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: de705351686e8a76779ea62ec9696b1b SHA-1: 328d4d5d40e3e5ffe67f29918c8ef5e5c945b358 SHA-256: 6f3c748d640a1bf0142bcc837a6fa66cb5f8737a9d1f956d459a318115d370aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. 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 PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, highlighting the suspicious nature of the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=konsep+industrialisasi+pdf PDF link annotation
    • https://trisyscom.com/userfiles/file/63103843642.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/dotixibodedep.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/vejeviwefuri.pdfIn PDF document text
    • http://skolky.info/foto/images/file/zuvov.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/wuwidiwumigife.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/86897540449.pdfIn PDF document text
    • http://halaljones.com/uploads/files/6092938968.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/ravikewegilunutipopubi.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/74265246635.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fenabovopax.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/jilexovusikikatejisat.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324c722e6cd---98450376292.pdfIn PDF document text
    • https://biocoils.com/img/file/79894366198.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/77114127695.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/98519145549.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/xakarir.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/wibumakiwabapib.pdfIn PDF document text
    • http://clingac.es/d/files/54437734422.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6193d9fe1ca224fd08b812f213006c5b/66981333367.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/jotipagisazuga.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/78320993485.pdfIn PDF document text
    • http://ux-school.ru/files/files/2826059066.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/84524624595.pdfIn PDF document text
    • http://pb-book.com/user_file/file/87857290283.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/webabovub.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_off0000c7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 17360 bytes
SHA-256: 3217ab34f74d968da8766077f364a6d49a8e84e2a5d2b44fa595c48c5077244e
font_02_sfnt_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 10584 bytes
SHA-256: 653468e7f57a9390d448bf5d04c14348983698332206adb475717f1746ab9b16

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