Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9717c9c108e48d6…

MALICIOUS

PDF

83.5 KB Created: 2021-09-24 00:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14a324018e642566d877ea58b93b3674 SHA-1: f7996c4e6ce8a6e8873762e50966411328bd371b SHA-256: b9717c9c108e48d6edf605e908c78777c592f2f2d6beaeb7aeefc4965dafb0d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded JavaScript (T1059.007) is a key indicator of the attack's execution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.firstpages.eu/app/webroot/files/userfiles/files/91834153939.pdf In PDF document text
    • http://pobierzplik.pl/uploads/files/8964449153.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/681937450.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/lozudakorokufiliguno.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/6751623101.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459e9610e6a---42780860164.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210902232149.pdfIn PDF document text
    • http://midospa.com/upload/files/dawowifuvukulakotodap.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109151245008586.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021092015213359.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/62040698968.pdfIn PDF document text
    • http://bankerz.in/qpic/files/sefodarapadegef.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/zaroxopofimunipax.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/nobinisuvazuxitowu.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/xovonodagu.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/wupukoxepawidupokefatunu.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021916023331318.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/naxuj.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/kematemelejetevutadi.pdfIn PDF document text
    • https://visualarchive.bg/files/fajerulefos.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/nopopemozepobagaza.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/mutafasakixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=firmware+android+para+tablet+chinaPDF 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_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 17844 bytes
SHA-256: cf985c8eb07540934f2f6c74443bcb7dc3bf6f4dfafcd3e4e76c9fb69722483e
font_02_sfnt_off000127f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F4 10816 bytes
SHA-256: 8b09583f29a824be775453509c058a91148e82847e33e3721c8f9463801e6aaa

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