Malicious PDF — malware analysis report

Static analysis result for SHA-256 469da198f5d3f9a8…

MALICIOUS

PDF

73.4 KB Created: 2021-09-09 04:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f26d60a2425ae01a3bf4a378cc0120f SHA-1: 62f7cffd5673dc337dec086b316caf1e46e633af SHA-256: 469da198f5d3f9a8c614d0e660ce1e87c3a9e25658a991c24b9ad3234649af56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The PDF structure and embedded URLs suggest it is likely used as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://synerhu.ru/uplcv?utm_term=jules+verne+from+the+earth+to+the+moon+pdf PDF link annotation
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/73064811392.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/83186593432.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/41670344929.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/94452579419.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/89154806598.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/lubaduzawopo.pdfIn PDF document text
    • https://redac.ch/upload/55905621498.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/sepudu.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/vukujelewibejodebelakifum.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/wimonibezanuxox.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/fojopemokexivijalojo.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/fupiwidulibek.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/fubekujekanuzatevepo.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/69088277518.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/82165551524.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/66254496680.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/61338200744.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/58870128687.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/tebadazez.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/4052944634.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/lajomupifexamivalug.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/26695443352.pdfIn PDF document text
    • 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_off0000bc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44D 10828 bytes
SHA-256: 5fdc182073a0efeec5a232878a00f08b3a767316e7561a770f97ec7d194eb355
font_02_sfnt_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 16648 bytes
SHA-256: 654925763f5a77ec72c1b2a2065dff4ec007b7f801d50b2c352b1f1f93167cbe

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