Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1c639135641dff…

MALICIOUS

PDF

73.2 KB Created: 2021-10-02 09:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e8bb5b8aa5dd69db0e4722111b6a5970 SHA-1: 04485a89505d3105689bdf0432a1e11fdbd6e0c8 SHA-256: db1c639135641dff75fd08c29409abe2aa10f9596568a9c6264f548c0652a3d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are hosted on disposable domains, a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pekingtogo.com/uploads/files/gagafodijaposojalozew.pdf In PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/20477688264.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/gufobajigabesilax.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/libanezabim.pdfIn PDF document text
    • http://peoplefoster.com/pliki/dixuvu.pdfIn PDF document text
    • http://samtekelektrik.com/files/binipituvuvobidafitemuren.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/38811429250.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/8628428665.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d38d5c504f78fb6f9568c9b9586b0fb9/60751621256.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/65077894830.pdfIn PDF document text
    • http://xn--12cf1djdb6cbcafdbu1f1cudgcc8am4wf7htgd9de.com/ckfinder/images/files/89882072971.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/95392505049.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/49637926934.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/95417985057.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/96305557115.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/vexabovalugakadiraruza.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/55920526231.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/20816214304.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109242350336142.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021923_14430_478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sysmex+xp+300+service+manualPDF 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_off0000b3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF8 11068 bytes
SHA-256: 31752c25be1c0556ea1dd4d08ed3619f325ad9f7e2bcd7f9887ee24adcd09c2d
font_02_sfnt_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 19232 bytes
SHA-256: a29eebf188db107f2a04e13bc5cd0ade92e243ffed21cc0e287de69b01953748

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