Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74c6b8f614b5cb6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 05:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a2a326e6a3e5a50c2985d88b0e8af8e SHA-1: a43920a41afeea99f92016c01dc61e5e9c3a89a4 SHA-256: e74c6b8f614b5cb656f55690a79b700bebc9773ce4523c7d1ee760efc8bbc1fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and heuristics point towards a phishing or malware distribution lure, likely leveraging embedded JavaScript for execution.

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://tinhdauvietnam.vn/upload/files/vizefuvegiboviniwomefu.pdf In PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/64642490249.pdfIn PDF document text
    • https://x-software.cz/data/file/gosibibowate.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/77422279761.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/xuxokadepu.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/67668705303.pdfIn PDF document text
    • http://santehnika34.ru/images/file/nudorumut.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/3485341388.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/32477780571.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/45594873221.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/15971743907.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/32096456696.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/16407674398.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/tamela.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/67193634637.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/xesorekalufagop.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/zarufokeriwumo.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ninugopofexaz.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8aa82682---60306178059.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/61247690313.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/mixiwerupotuj.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/50686253915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=iphone+receiving+texts+latePDF 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_off0000d60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 18092 bytes
SHA-256: a4051ee2e229fc6e9d9e1cb46c0a12aa62a94adb7ae9cd8a5c17bdde1848a515
font_01_sfnt_off0001052b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D42 10772 bytes
SHA-256: 6ea25355669ec3ec14b0a3c2750ab7ed9292aa0f7adbb3746214af04280f647e

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