Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed58464d88e6348…

MALICIOUS

PDF

88.4 KB Created: 2021-09-10 09:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c6bf79e4b67d7c6023fc0011697108c SHA-1: d4fe32cb2450764361a87a5cc2d323bc5e8aada3 SHA-256: 4ed58464d88e63484e09c74eeee0efa9a0ab36cd56956c82a4aae79899230f10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains. The PDF structure and embedded content suggest it's part of a phishing or malware distribution campaign, likely using spearphishing attachments as the initial vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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.
  • 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://sadhankendra.org/erc/media/litemorege.pdf In PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136170c4648a---40048724160.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/gapebanonuwotefu.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/89759959600.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/15156872931.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/6968240828.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/76354826940.pdfIn PDF document text
    • http://insei.eu/userfiles/files/juniwarajovitakamoribe.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/dawuvolesuxemilobo.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/mojanomovonek.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/66355843695.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/zulirapivivajesanukuji.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/32729090543.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210907_CFECDCCBD0262C49.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/sutofotadebizuzurejujob.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/49678099095.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/lipaxefu.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/xizakiwujalakirolol.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/38980212584.pdfIn PDF document text
    • http://imi.vc/upload/files/nojevovedineferiledewe.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/14017370017.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/lugelomosow.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/vidofebajipurudujobubi.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2a76c16757e977073d4c4c52e3699851/15530046604.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/31021161369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=one+time+password+generator+code+in+android+studioPDF 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_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 11024 bytes
SHA-256: acfae97dae2b960a7b0e0b94d8e33ae543bb73fa6c192e43cf513e8b20570516
font_01_sfnt_off00010d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 17940 bytes
SHA-256: 28448293f06359c970b3a3809da1a0142550f0243b7634c4da477ba276f9761d
font_02_sfnt_off00013b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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