Malicious PDF — malware analysis report

Static analysis result for SHA-256 0519db9258ee8345…

MALICIOUS

PDF

173.5 KB Created: 2021-10-10 03:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d52e38a71b5d9ef9654e58fd8fd37eb2 SHA-1: ee30c453645df1b847376883fa5eab8e780b1349 SHA-256: 0519db9258ee83458d37342e6c104d44218adbbe0b4635bd72baa090aeee02c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it is a link farm on disposable hosting. The PDF contains numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent through external URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://coretry.ru/uplcv?utm_term=praise+him+while+you+can PDF link annotation
    • http://atreve.eu/ubezpiecz/obrazy/file/tigiziwiba.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/95843194430.pdfIn PDF document text
    • https://afayl.com/userfiles/file/vamopuwo.pdfIn PDF document text
    • https://ijestr.com/ckfinder/userfiles/files/76600533223.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/30518936078.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/3927692914.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/lawexebelatuzopow.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/jifodafiwizofexigojunuvu.pdfIn PDF document text
    • https://777mto.org/contents/files/netor.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/59785689617.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/73322520344.pdfIn PDF document text
    • http://vibratingsieve.com/d/files/79498807021.pdfIn PDF document text
    • https://maisonforville.be/documents/file/55153477472.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/xagezagusavaj.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/rilemejosurunonevodomu.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/xalixazotokezimojek.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16160b2abef7e6---paxanigobalerufoximo.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/xorefejowenevisokaxoti.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/77696818081.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/75607982048.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/32443026321.pdfIn PDF document text
    • http://hiddengemsbookstore.com/userfiles/file/rokewipukakegotadaxolum.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/40456912667.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/52809548348.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_off0002362d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2362D 10696 bytes
SHA-256: 1f2cd90a3066fcb66915d9b4181fcb26258410e8fb644cab6a96cf00c5cb3ed7
font_01_sfnt_off00024e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000266a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x266A5 25944 bytes
SHA-256: cf8af359a036270e9edcd6bc7d0d13f20307d699b8cab064520f3c0ce162a394