Malicious PDF — malware analysis report

Static analysis result for SHA-256 75422d3331f156f4…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 20:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a9761aabd84e3151a1e684d5eb0edf2 SHA-1: f7acdcf2961cf5c2372540b07659c9857211fb47 SHA-256: 75422d3331f156f4825372b1342a313ca92f29bb0f58383f11c7c382d3985a98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for a large number of links. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

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 http://natinsel.com/imagenes/file/5676545678.pdf In PDF document text
    • http://prompol.com/media/file/25351513120.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/27138776260.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/11978073964.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/59407913594.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/tupuxako.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136543b18108---xejamoxu.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/tedodurabufaz.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/xufelukojosetasosi.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/90920017709.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/9515f7770ev3k179q8sritl6p7/xasejok.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/11503645406.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/9357563529.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/vulux.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/nogoxulezuf.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/77810132499.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/gagexesafogazawefe.pdfIn PDF document text
    • https://emenu.hu/editor_up/kawofuwizukegid.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/17950085756.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/tusir.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/zedutuforivur.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/66720182752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mirror+laptop+to+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_off0000d8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 10080 bytes
SHA-256: e23c9cda298115de99df443a532f52786c66604769e5756b83ec742f6136cb53
font_02_sfnt_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 18076 bytes
SHA-256: cdcacfa791e5e681e3c08da1576d1d49ebcbeb178b3c43bb2adbdd0b795f0945

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