Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f8c383f79c2bfc…

MALICIOUS

PDF

73.8 KB Created: 2021-09-11 08:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b7a904d240038e05a0e0a7d5f7fd996 SHA-1: a83d28eaf541ebd5a8c4733f57ad54903a58e32c SHA-256: d5f8c383f79c2bfcaaf435017cd5224b225ecc9832d378bef462f031af093e83
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The embedded JavaScript, though not fully detailed, is a common vector for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://planetamama.ru/files/file/95004589563.pdf In PDF document text
    • http://mmsmarin.com/imgimage/file/84563360322.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/gowotafadapomevusedotipor.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/kukakikomozugob.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/tijegojexivofebufa.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/zikibe.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/tedenifu.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/98405186854.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/86759429503.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021981645307117.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/likuladoniwa.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/vazexiliginejodo.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/60420647208.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/1433182808.pdfIn PDF document text
    • http://csp.hu/editor_up/97747149130.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/47020407332.pdfIn PDF document text
    • https://emprenderem.cl/files/xasawevunep.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/59536500228.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/29536502290.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/jivetewet.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/matesifivakevupibopuru.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/jeparuxaponixololaxi.pdfIn PDF document text
    • http://tulga.ru/editor/files/92811067066.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/petexajinizoxotibisodura.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/tozovixezewizafawofuvov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=standard+deviation+mean+graphPDF link annotation
    • 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_off0000bcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB0 10768 bytes
SHA-256: ff7ae839ef3356137e46d9b6ba8511519cd5c0205893c84e1fdbf42c975221dd
font_01_sfnt_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 17316 bytes
SHA-256: cfb62d43841fc06f62fd0abf7cc950869e19b5f7b9b7a4283cb40145be791a98

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