Malicious PDF — malware analysis report

Static analysis result for SHA-256 f461e5cbe7b2190a…

MALICIOUS

PDF

74.4 KB Created: 2021-09-18 06:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d44251e816a5c8e2c3c7f0c919ab214 SHA-1: 8ea426da9cea31e99a5992fa3a87aad074e21d87 SHA-256: f461e5cbe7b2190a6546958eab86b321356c47b51207d6454fa7f0d3980341e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on a variety of domains, many of which appear to be disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute content or phish users through these links.

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://philabc.ru/uplcv?utm_term=pixel+4+launcher+apk PDF link annotation
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/89495280029.pdfIn PDF document text
    • http://clickvay.com/upload/files/dojigewininoropipawiwuxo.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/5317987176.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/66339523813.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/90969166034.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9abb0731---43884822577.pdfIn PDF document text
    • https://satesayap.com/contents/files/89179208687.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/losezubinezuxup.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/67920771685.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/24965309320.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613848626cac5---48070980016.pdfIn PDF document text
    • http://davcpundri.com/css/file/pinefijebum.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/gatidoselowetonovot.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/96058566524.pdfIn PDF document text
    • https://atarentacarburdur.com/userfiles/file/virafufegokumiwes.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/55721558131.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/jogasufagixilurererakavix.pdfIn PDF document text
    • http://hanleyresources.com/images/97462308879.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/posurekefixadoxupuwizogik.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/bokanavegifoto.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/nisufogojegisotuzefutox.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_off0000b77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 10460 bytes
SHA-256: f9a06b0e6a789caab9fd3c9aa6aa07a180b8d738704951b73ceb514731976fde
font_02_sfnt_off0000e738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 20432 bytes
SHA-256: e490649a7179f175d6153763e23225b76e2b96693cc1fb9df2fdd0a574ac2238

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