Malicious PDF — malware analysis report

Static analysis result for SHA-256 59631352393480af…

MALICIOUS

PDF

96.8 KB Created: 2021-09-20 12:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 610039050e6c8187e62ea2de1a8c87ba SHA-1: 095f0777098cdcf5a5b85d8b7b1b29ce8dc0d2d5 SHA-256: 59631352393480afec9ebc11b13ced932d7615f5b3b3ad75126378d042a91c22
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains malformed exploit streams and numerous external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The presence of multiple links to disposable hosting and UTM parameters further supports a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://cructi.ru/uplcv?utm_term=comment+enlever+le+mode+s%C3%A9curis%C3%A9+android PDF link annotation
    • http://yachtandgulet.com/userfiles/file/kagojefesaxutezew.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/39446066484.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/jasukogulenijeru.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/jafixapetovukike.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631515822.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/makuxo.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/vogegubokibiro.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/16909903475.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/sijujopaporezenewovo.pdfIn PDF document text
    • http://saimiri.name/upload/file/27029920377.pdfIn PDF document text
    • http://opersan.com/file/81468584428.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/buxomidazanorikodura.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109080715292123.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/58699638094.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/14159070506.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/sofakizamu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147a53f00de0---tazekatuzipuwa.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/17911649453.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/31977481956.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/firaxaxajedozisuzafi.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/peramaxopewigovulojafo.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/luvezarofipififoj.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/gamekasa.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_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 20032 bytes
SHA-256: 0138c9a21dc9186bfd2ddf6f5192682209e4bf50c7034f459719ed9baa0e479d
font_01_sfnt_off0001423d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A54 10884 bytes
SHA-256: 068c5fdc2c05b9ac3d0bd9c70e346acc262f6989728d583b68fa17e621560ad4

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