Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79a6d3af096aeff…

MALICIOUS

PDF

71.3 KB Created: 2021-10-01 07:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c6485ce9630d740f040917fbd6c074b0 SHA-1: 23d66f259489e7c669d131d11eb336626f04a704 SHA-256: c79a6d3af096aeff5656ad4fe46cd6762f33c1e1fa9e833778d22702f94dcae3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. Heuristics indicate this PDF is part of a link farm on disposable hosting, and a machine learning classifier and ClamAV strongly flag it as malicious, specifically as a phishing or trojan variant. The presence of external URIs and the overall structure suggest the PDF's primary purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=download+bus+simulator+mod+unlimited+money PDF link annotation
    • http://mebelhotel.ru/userfiles/files/momojibi.pdfIn PDF document text
    • http://chinalabware.ru/d/files/99203895110.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631955870HVpR.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/lexabunokegasato.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/monumefakosinafasewe.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/5009323432.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/bikodamanolodo.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/lofesow.pdfIn PDF document text
    • https://aokman-drive.com/d/files/juzurozuku.pdfIn PDF document text
    • http://52963566.com/upload/file/202109090111316042.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/xagawabitixisote.pdfIn PDF document text
    • http://hanleyresources.com/images/veguladabasi.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/wuditefonud.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/mavepisefamip.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/jodomi.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/16949504009.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/fewas.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149f2419e6a5---96241464544.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/81707083719.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/mozekijukifovigax.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/sujawabu.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/74354981982.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/betibovusotuwetupoli.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_off0000b10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 10852 bytes
SHA-256: 053e727f76d4a948bf2b7fa351c0223a6fe4a47a5a8a3dfa86d6eb8839650e62
font_02_sfnt_off0000e235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 17656 bytes
SHA-256: 4dcdc19ee2d6bea1b0f5d3b0a9e7ab936f02b4e3a8e40787457a9627ad77ee39

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