Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46270b3af0badec…

MALICIOUS

PDF

74.5 KB Created: 2021-09-25 11:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 33c8ce018b40f3cdf842864fb5e9fe92 SHA-1: 652d18e80b896f24461067f646027c3a94b2694b SHA-256: f46270b3af0badec32e6f1a9cd5c8cacc10a54cd2062215591669fe69acbcef3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=words+that+start+with+a+and+end+with+n PDF link annotation
    • https://zifu-tech.com/app/webroot/userfiles/files/13491056776.pdfIn PDF document text
    • https://m3nan973ru5-pa571.com/contents/files/jegixekapizosivigat.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210918_085001.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/48730187843.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/99497096100.pdfIn PDF document text
    • http://sbcnepal.com/images/file/xevekolujogize.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/wikatu.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/vofiviruwinepigowenabir.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/1516156408.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/goxuwojiwavejuwutuwem.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/bewagomejatilesed.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/lubolanikowegisimiv.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/zixomobariworugenuwu.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/73394129499.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/33656171446.pdfIn PDF document text
    • https://matrixx.lu/images/wusoxebinewaxo.pdfIn PDF document text
    • http://bancodevida.com/bancodevida/admin/images/image/file/fivuv.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/buzexutexitebegajajud.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/90103851384.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/zesogivaruda.pdfIn PDF document text
    • http://chpcentre.com/files/file/guvesupadodinebus.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/wekaroxaba.pdfIn PDF document text
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/64985616726.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_off0000bdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB6 10380 bytes
SHA-256: 10bb2469aea51c99353ef6929721343332d0c5cabde55d5ea93de8ad858516e1
font_01_sfnt_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 18020 bytes
SHA-256: 3714bbe0bac376adee6681f400678c7f56e39d5221126c0518367b4b93ca73c4
font_02_sfnt_off0001046d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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