Malicious PDF — malware analysis report

Static analysis result for SHA-256 d02fc83e6ca340d9…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 23:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89ecbfa069d8a51ef554c56fcde75adc SHA-1: ceb15fafb2c58c9e6ab59afde7e16816490f495b SHA-256: d02fc83e6ca340d9dfb334dd8b94c4f6d2d152341572a62a99a147b97bfea6d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hcbarrett.com/user_area/file/gudaxosezadudotukodageji.pdf In PDF document text
    • http://accapierre.it/userfiles/files/57718430411.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/zojasitabifoni.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210908022849.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pojilopugezexajaxerewates.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/tumarituxewokoj.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/2087885703.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109051302357865.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/65570376899.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/43160350915.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/jabopejojutojovat.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/gidimiwegemipinogotubaj.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/fajukup.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/18014209902.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1631129489.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/97763652483.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a47300a6f9b858d3728ed9c721f0e7a1/munatetevekesekabis.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/jopupelimegosimalisilima.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/20067658058.pdfIn PDF document text
    • https://gencatakan.com/upload/file/sazutisezizaf.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/23764656644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=android+transfer+files+to+usb+stickPDF 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_off0000d311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 10784 bytes
SHA-256: 721cd3377e3eafb6ae5a2f85fcdd29cc428110d1feffec2651355c88824cb4c9
font_02_sfnt_off0001041f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 17324 bytes
SHA-256: 901374849f864efb61c9376bc144d76399c79baf931f2e372a4108c440b593a7

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