Malicious PDF — malware analysis report

Static analysis result for SHA-256 a315003d87ad24e4…

MALICIOUS

PDF

72.3 KB Created: 2021-10-03 02:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: befa74e943100ec4ee8e7c6e8b21ab7a SHA-1: 702a5d8be4409d59028bb19925d6d277eab27734 SHA-256: a315003d87ad24e4d23c5d31107c5d92a5c10a7f761ed3ce8a5d9770b49c2a8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to potentially malicious domains. Heuristics indicate it's a link farm designed to redirect users, and ClamAV detection confirms it as a phishing/trojan. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://elitacasa.it/images/file/giruxojefavu.pdf In PDF document text
    • http://emailreceptionist.net/userfiles/file/56257109780.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/c70euvvcs1lf45ls47f77a7m31/72152764014.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/lefodewiga.pdfIn PDF document text
    • http://jyy.jp/ckfinder/userfiles/files/20210930_152657.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/70474291391.pdfIn PDF document text
    • http://asustainable.com/global/file/siperewonun.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/35637671011.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/selinuk.pdfIn PDF document text
    • http://mlight.cz/archiv/file/fimipaletovoloj.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/33515684031.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/20415939110.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/13075831568.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/13263325792.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/47858826964.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/jopesedu.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/zizoxarog.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/zojafaroramerimaminaxu.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/kafumeruxivivis.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/peviwutufuvekujelifaj.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/65042199220.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/lanazimadaxuzawovabimax.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/giwemat.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6e41919827736e2c9eeaed4bdc9f56e2/66840084315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=definition+of+refectionPDF 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_off0000b42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42C 9952 bytes
SHA-256: 1086fedef154062e75d18791f71f11c9376c1696c830271999a44a7fb87e9fff
font_01_sfnt_off0000ca4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 19236 bytes
SHA-256: 17cb5043ec1483655f88c77a24d63415810c6dfec26e95b9f2bc08a834510cba

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