Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc308f94fb88d59…

MALICIOUS

PDF

85.5 KB Created: 2021-09-10 09:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 541ce8eafe8f3abc3c5eae72c0d1a531 SHA-1: c38eefea5bb713f923de381ffb46cc98f7b0a96e SHA-256: 6fc308f94fb88d59eb6602ba60beb8fd5b747975145e6304ac9500caa6342d1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://thailonghoang.vn/upload/files/17230677379.pdf In PDF document text
    • http://saimiri.name/upload/file/34592405132.pdfIn PDF document text
    • https://ka-base.no/images_content/file/zefatumuv.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__613A849BAF334.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/bezogibe.pdfIn PDF document text
    • http://kaies.cn/upfiles/2109080428293776980m7rc5.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/luroliwegosunukigiza.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/kepoxen.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/bufixevoja.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/rejesav.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/1883051100.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/tejalabex.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f860a3b81---25790470347.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/14362682284.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/44516900693.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/92731062609.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/3e5e11503c6008dd4208cebbc2bf3960/83078718777.pdfIn PDF document text
    • http://ihdbd.org/upload/files/pitizafemufofolifuze.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/mabipatobujowupimalenikej.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/77488111087.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/perozowurixupipir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+theme+maker+for+pcPDF 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_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 10744 bytes
SHA-256: 1380f9945d72e24f83f56fdb9201f76f9fc5944a9bc766c3c1884f408a7e45a7
font_01_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 18784 bytes
SHA-256: fd9326deb5b9969bb9f37677931c59fb2d5e47b80ffbf28643e8387e2e8cfb46
font_02_sfnt_off00013068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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