Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3893bcc8bcdcb0e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-27 07:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 13b5e122b68e22235b2d244572426094 SHA-1: fa9a5e1bc6785ed3276c105b87885ea94b598717 SHA-256: a3893bcc8bcdcb0ed2bff611f8f345264c4a147c36ef6e10562c790d77e2aa50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is the primary function. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://allytemp.ru/uplcv?utm_term=sun+tzu+pdf+download PDF link annotation
    • http://bycongroup.com/UserFiles/file/87384895379.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/46201099943.pdfIn PDF document text
    • http://186086.com/upload/files/somazepezebowozemozopota.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/nixobebanigajufeda.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/ragusimija.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/41001207264.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/ledadid.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/firidamixivakol.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/nixupezodebemepene.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/15827926388.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/21515699202.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/14298037151.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/90227632303.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/xupinisowegomubuso.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/fokuturiw.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/wuletowijo.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/37358201815.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/8801510173.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/68676053010.pdfIn PDF document text
    • http://labsshop.com/d/files/zamowefejitidux.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/jipiwugejekarosu.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/12192614080.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_off0000b8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E7 10320 bytes
SHA-256: 792c57e754ce87527d8d690437a162b4fbe68b88fd9e182b34a41b67e1678f32
font_01_sfnt_off0000d072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE884 18916 bytes
SHA-256: 9e254dded4e2caf5c2376f722f657713d03e040fd6da0520028f8cf238c2f10c

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