Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab37644939f392c…

MALICIOUS

PDF

72.7 KB Created: 2021-09-28 07:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6809125b8eac4d2217e20bd0014380fa SHA-1: 636ba9833d3bca9201ef1699fec8c71813f409c7 SHA-256: dab37644939f392c69f583990efe9ab555201da61a86bda8dbef632cdfecc2dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and acts as a link farm, with one specific URI suggesting a lure for downloading software. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=poweramp+for+android+apk PDF link annotation
    • http://nj-rshb.com/v15/Upload/file/2021924413338630.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/gawafekifoz.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/47930996885.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/begelulipineremeku.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/pukewanelulerikuvifuxi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6e38124b---49951881411.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/462447148.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/53071657663.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/kobupidegekulozajukimepib.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/9331116083.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/71236324728.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/25187737058.pdfIn PDF document text
    • http://asustainable.com/global/file/19267435509.pdfIn PDF document text
    • http://anton-joyeros.shopcloud.es/ckfinder/userfiles/files/67854608139.pdfIn PDF document text
    • https://parfumzone.ro/files/file/bufidukawoji.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/11965840687.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/dologana.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/xuzivamikulidoderumuna.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/nipej.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/magejo.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/tagakokos.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/61947540936.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_off0000b6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D2 10524 bytes
SHA-256: 7d819574e7644da74cb63be2bc1ec528be4761a8fbb3a2aa7b58c8548f64cb5a
font_01_sfnt_off0000cecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DE 18092 bytes
SHA-256: 877e2ba1af8dc8fc227a39707ea0f8dee1a61ad8c4ec27a3125bb1f50cb3517a

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