Malicious PDF — malware analysis report

Static analysis result for SHA-256 594971a9abc2473e…

MALICIOUS

PDF

78.2 KB Created: 2021-09-14 02:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c55647d128921c5b97a7db0fcd2d6963 SHA-1: ecb322b16c2988c78f7ec9e2e4b201b9df2890ce SHA-256: 594971a9abc2473e073a0ca17d14880a747d18b265d02a08b8dd027a2b7a71ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable domains, indicating a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://indyskischool.com/ckfinder/userfiles/files/mukopikidunasevo.pdf In PDF document text
    • https://luatsuavina.com/userfiles/file/47274347712.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331701daf3a---fonotivivaji.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/tuzunoxasafo.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/19884573959.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/tajiv.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/46280265034.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/46825824881.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/diliboxeketomofexuritis.pdfIn PDF document text
    • https://krossi.ru/images/content/files/68811426090.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/suvireze.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/17424521204.pdfIn PDF document text
    • http://africareview.in/userfiles/file/671665077.pdfIn PDF document text
    • https://preciseenergygroup.com/media/gaxila.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/sogiket.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210908223252.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/kixuxusegan.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/ximesezekefedegokizo.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/somakuzokutotezixe.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/9446481882.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/mejamomozumimo.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/gufajotolujapot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=kannada+typing+in+androidPDF 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_off0000c3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BA 20976 bytes
SHA-256: f313e46e16444fc8d6c3039f4a7e61ef3245f5e3f03e66a0109d9488f72c6abe
font_01_sfnt_off0000fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 10324 bytes
SHA-256: 6415e4f7866531afd4f4941735c0b9549ff2dcc4da0cb2e78c1f37b9310fe803
font_02_sfnt_off000111ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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