Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b2572d69b8a247…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 07:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8beb5df2c3d20dfbf8baa4a4a9b8c9ea SHA-1: c2f15743264dcb0f1c045f5701ef130869a15315 SHA-256: 91b2572d69b8a247fe660aa140c08bd7b78f504b811672c0dc6ad6a1499a623b
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 structured as link farms on disposable hosting. 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 exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=snaptube+apk+app+download+latest+version PDF link annotation
    • https://2ruoteexpo.it/ckfinder/userfiles/files/bepebizesumefadarapudin.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/4630792426.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/61078343699.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/mizadunawuwavulezukoji.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/faxolinewoweperonejajorid.pdfIn PDF document text
    • http://anninh247.info/upload/files/75744306619.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/veruf.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wiruguzoduxojonov.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/63242155850.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/45284043539.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/sebumatonififesapuvedujoj.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/56011178709.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_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 19480 bytes
SHA-256: 5e46a1fd0a67aeed2483c8eea4ceb7dbbaf3226305a09c1ec21dff7fcd7164f2
font_02_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 10944 bytes
SHA-256: 5ece537490a9ee465525207ad2276ad30a912157bac7bc7a29368c8e46c7d1ed

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