Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6602a81d68bbde…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 20:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 192f99de37579d8e9deeea311bd582f8 SHA-1: 3c4c4de1ba41eb487f52eece8097f7c7e801e8a9 SHA-256: 0b6602a81d68bbde8fe352b5208c2cd61e6b14e230df971e2da9d670cde3d333
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of 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 phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=now+launcher+apk PDF link annotation
    • http://draftingfloorplan.com/ckfinder/userfiles/files/83235738757.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/66094503876.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/jovamuj.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/tasapetis.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/nidogoziwosepiwotoso.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/91666022915.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/86775655886.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/78954276561.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jozarovemu.pdfIn PDF document text
    • http://thaide.org/userfiles/file/degaw.pdfIn PDF document text
    • https://kar360.com/resimler/files/19994957561.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/11089981954.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/76891132676.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/47402452615.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613d949e02426---zemojukororoxirerew.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/xusijegoponasaxelezukuv.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/40886129617.pdfIn PDF document text
    • http://minerva-collection.net/files/files/titojagepapizokezux.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/jibubagizazuputu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147089d22715---77228946441.pdfIn PDF document text
    • http://etspak.com/survey/userfiles/files/fegivow.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/riwekidudipural.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/zolebozikuraleradoz.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/juwaxubokegiz.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_off0000b17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC993 10368 bytes
SHA-256: 397a2d2464fb9f1f69d5ecda419f2a555a288ca69897e010d8abfc6300017bfd
font_02_sfnt_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 16648 bytes
SHA-256: ddc6aec2565735640afda85e255506eef156c1376c053955d4af76e66882fbb7

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