Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89f7a9d2b33bea4…

MALICIOUS

PDF

76.6 KB Created: 2021-09-18 04:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0801f98cd1acfea7f47b61480c981acd SHA-1: c921d3c2677c178338e0ac525b70ecab84045783 SHA-256: f89f7a9d2b33bea4d9008fbd189c3c7fd63f635f219e733142c1177a05025bd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pop-around.com/file_media/file_image/file/widofajiruduri.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/d6eeqi5rcmem5c2oe20c28j558/49166661339.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/gegijedarufusi.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/mofusivaxuzozuwetuxa.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/27844819580.pdfIn PDF document text
    • https://bor-diing.com/upload/files/kavonojodajoritigumukis.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/10803227110.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/waretunazujijodenulefelo.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/muzobi.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/muxizesovu.pdfIn PDF document text
    • https://banghenails.com/upload/file/79219046266.pdfIn PDF document text
    • http://ccshecea.org/upload/files/54905338224.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/fasuwusamu.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/piladulikewadoferavixa.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/suneg.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/28125164581.pdfIn PDF document text
    • https://polandpools.com/contents/files/norabasivisirovudadir.pdfIn PDF document text
    • http://tzsunup.com/upload/nopitidoxoja.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/37185242615.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16143f6b90c83a---76771537727.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/telegaluravitimakegijow.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/17193666311.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/93312328767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=all+ladies+do+it+1992+onlinePDF 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_off0000c1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F5 18840 bytes
SHA-256: f1dd64413308d56abc370f9a5af235f90835977733693517425e103a66c538e4
font_01_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 10460 bytes
SHA-256: be4da079efc9172999603229a982182444d6febb1db07fc9187fe0ab480e897f

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