Malicious PDF — malware analysis report

Static analysis result for SHA-256 48613d5e5a31c5c5…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 21:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f17d5b7302f756d232524eb59baebeab SHA-1: cefa7ee5e1c3a26318ae3b892454c89cbead337a SHA-256: 48613d5e5a31c5c5fa89802941c69eb6573398ff6beb3e05e03d8d913d8eb88f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and a machine learning classifier. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.piramideidiomas.com/ckfinder/userfiles/files/rexonoluxo.pdf In PDF document text
    • http://abwbaltimore.com/uploads/files/61729023762.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3486345873a3a1f6ad8eef2e1bf40660/24796960.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/bovaru.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210908041354.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/030953337569.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/zivivadopufaj.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/59029141668.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/99840769287.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/numuzerukul.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/79306279820.pdfIn PDF document text
    • http://huiking.cn/uploads/file/012103028542.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/mojomize.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e5757ceaa---refirawitas.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109012011236032.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/pegabijawixabuluvorudoxi.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/juwikewasixunapofiputom.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/70841002961.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/62952418961.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/82623344127.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/34207815730.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/zomusipibudutazolez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+hobbit+comic+book+pdfPDF 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_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 17856 bytes
SHA-256: b5e6ed34e844bcfb44bb3581162a0313e10d7f677c3632aa3fad97f851ffb8d7
font_02_sfnt_off00012ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD2 10500 bytes
SHA-256: 4552b4cec5bdac4876c1112b01c3943e3c0cd1bdb4de4b808ec78f8cb78ca9be

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