Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f2bf1a852d64d6…

MALICIOUS

PDF

95.8 KB Created: 2021-09-17 18:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9b647156ea47dbfc5edbe00ddfe3c3cb SHA-1: 089d4fba0039a63482ee4783c7f402cbfdf7312d SHA-256: 52f2bf1a852d64d68e069ac4a66cc4f33ce99faaa8b0aea36ef3be91892272e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links to other PDFs, likely for search engine optimization or to distribute malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://xn--80aab8aioy.xn--p1ai/userfiles/file/37229644804.pdf In PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/16133543143.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/55568514877.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161406d9966fa0---lulizi.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/wulopaxijulutu.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/25423679168.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/62387435570.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67878188241.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/wuviremesuxo.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613452756710e---88775991715.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/duwawomomanogefodur.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/fokemokigekite.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-17/20210917061727449930.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/77079095131.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/27240163765.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/datewonininusex.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/nejoledanamijuvisekaxobes.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/51121436302.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/58229148092.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/37444299611.pdfIn PDF document text
    • http://vkts.se/userfiles/file/99437050498.pdfIn PDF document text
    • https://cian.hr/userfiles/file/ponatadelarox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=when+did+the+first+droid+come+outPDF 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_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 10628 bytes
SHA-256: 8840811badf181231e3dacaa16f431efa949465b5f66d003585e259d04e6ce71
font_01_sfnt_off0001200f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13821 21936 bytes
SHA-256: f3ea520dfbd60c9535026c0c3362a9134ef04cba0923ebb72150bf9b41dcea9b

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