Malicious PDF — malware analysis report

Static analysis result for SHA-256 24168b462479a338…

MALICIOUS

PDF

77.5 KB Created: 2021-10-23 05:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 20ef32a696e3fa14448c5fe46949a67c SHA-1: 7c5ca7a6d5c8ca0dbdd13bbe1be55a39cbfc7aec SHA-256: 24168b462479a338a30b80a7f563e7328ecf1e4f29735f3dd0ac2316e24fe3c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or a distribution point for further malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cpviettin.com/upload/files/6135650926.pdf In PDF document text
    • http://piqiso.ru/userfiles/file/77989299265.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/paxujobavitenemupumasujik.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ddb0e4ee6b---tawarife.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/93669070994.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/pibekofofu.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/xunixubajurezowope.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/gozomenodaxubuvelexofon.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/vamigutin.pdfIn PDF document text
    • http://ternovykh.ru/content/file/50749247248.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/savasowiwadop.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9e2f4ebc58b2532635955cc45112b6fd/nabomuduwi.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/zafunibupewoxopi.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/88134277388.pdfIn PDF document text
    • http://snft.ro/media/file/numijikoda.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/56902748627.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/mujud.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/38643184575.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/74501758451.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/18959696509.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/49376570919.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/12305445878.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/46345145082.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/4dZi1sgP-vI/uplcv?utm_term=how+to+determine+percent+compositionPDF 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_off0000cc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8E 17008 bytes
SHA-256: 5b25358da4bacc610f02552622bbe4151f27df73b1bff70dab54f9a53e39e1d3
font_01_sfnt_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11099 10544 bytes
SHA-256: 5d9da3190bbc90f935391e935de81241be8840184cbc5e59f8c802498aebe84e

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