Malicious PDF — malware analysis report

Static analysis result for SHA-256 98921ff475fcf867…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 21:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13a75b4b1e43c23c92e06f86f41aecc0 SHA-1: a4a1e66b91e1a5168929524c77eba9d3c5b83f46 SHA-256: 98921ff475fcf8673b88dee70b8131be75b04a83185443549478956b55efd463
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting an attempt to distribute malicious content or phish for information. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses time-sensitive language to prompt user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=how+to+know+who+visits+your+instagram+profile+the+most PDF link annotation
    • http://designklasse.de/ckfinder/userfiles/files/rakisegiworuwot.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/gakemojamipo.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/340231f54259d1b859deea7bd6bb8fd5/56254658808.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/87728536100.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/jinufafejupuxozevowegipis.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/vigujupogemavekeguvenaw.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/26994393322.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/revokikamupugesubi.pdfIn PDF document text
    • https://medtek.vn/storage/file/fizamenawajutuvinenu.pdfIn PDF document text
    • https://slide-bearing.com/d/files/kamitewaneragaxojapudega.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/futitokekebipujik.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/jikanetutu.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/zokebepaj.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/89590447596.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210908123749615205cmlnr.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/77919526551.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/21512108128.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/xekizata.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332674ca3f3---zojef.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/kumes.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/58035416656.pdfIn PDF document text
    • http://zaiger.ru/img/file/55575739488.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/33131882330.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_off0000db32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 11256 bytes
SHA-256: d469092701ad2723ef13b8c92bb6f3bc850931b324fc0970a4836e2a448237c3
font_02_sfnt_off00010d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D93 17244 bytes
SHA-256: dabc8c07b13b1ceb7eec3ae2fb6721ed73456f0c457ef1815f1b66e3e1eb599d