Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a6b64a521c95ab…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 03:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f6bc1afdf657e12e65e2b92534c3f6d SHA-1: a357a5de5b20e6b7cc33ced5df1950f570805bef SHA-256: c6a6b64a521c95ab0422bfbfbab4bcde08f81b77d541186b6c142fad082db50d
126 Risk Score

Malware Insights

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

The sample was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The PDF contains numerous embedded URLs pointing to disposable hosting, forming a link farm designed to trick users into downloading files. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://relans-nn.ru/images/docs/file/lugajexenupowebaxaj.pdf In PDF document text
    • http://gdgom.com/upload/file/210905202223663140j1710e6ggm7j.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/sejiwufog.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/womoxivu.pdfIn PDF document text
    • http://ndt-ultratech.com/files/21241474759.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/97234434678.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/bovetedivotatekol.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/66255942414.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/fulorudemutesu.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/balemolowajem.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/zogasasolenamixedidu.pdfIn PDF document text
    • http://konberdbio.com/upload/files/fonorotakajuxoka.pdfIn PDF document text
    • http://simoncaulkin.com/images/102620440.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/maniwelunujewikizu.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/mazivudumazuteramepatake.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ac35acfae---vezobawekewoxidon.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/92503827494.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/buduzoj.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/63771801551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+wps+wpa+tester+premium+freePDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/pixavuto.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_off0000ced3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED3 17292 bytes
SHA-256: d03ce30d7022ae9c5f4095bf856c248f4e8d1fbce6c795738664bbd1fe73ddbc
font_01_sfnt_off0000fb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 10848 bytes
SHA-256: ed052c5a26b81f68c5a9b4ad00eac1f07b9c1bb2df0dd2d29a28ed9f36a1efde
font_02_sfnt_off0001146a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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