Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6dbe062bdf6a0c3…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 22:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 99053f4b6391fd389b51ddfcb565193d SHA-1: 46c7fc56d7fc8cec8137f200ccc92501fcd77239 SHA-256: b6dbe062bdf6a0c3a9e6e5b92eb755d04309b457f4fd667a0da5bd1ee84cc613
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://irlanc.ru/uplcv?utm_term=wwe+2k19+game+for+android PDF link annotation
    • https://angelsstaff.com/uploads/file/97032077153.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/porib.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e92f216d3---443504738.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/erigit.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/90239875418.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/pufedamigijopiti.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/64534047610.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/14286460990.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/nodokevujurimafuwer.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/33391773427.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/vogugarumumoruratuwomak.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/69162044875.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/bunefososurodu.pdfIn PDF document text
    • http://datcat.vn/2018/file/barunotuvexof.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/gasixotexe.pdfIn PDF document text
    • http://knipia.com/userfiles/file/2056659714.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/kizexivawozefotejovevoz.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/fuvuz.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/kasebegolujab.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/sufenuzutinunogezururemi.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/48223621862.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/bexodomed.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_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 16664 bytes
SHA-256: f3922742ac7b9dea3641e22a1de79ce3e786812f8cd663a45948ea3e1fda1b7e
font_01_sfnt_off0001188d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A4 10896 bytes
SHA-256: d3e1696d129e36b0a9cb3dd7acecb069d4d85a2100a7562c1e257f01a10614a9

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