Malicious PDF — malware analysis report

Static analysis result for SHA-256 6578ecab80460631…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 18:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a7c2f11cc7793f9bb2f96a6821092e5 SHA-1: 2addecba4508af9674fee2a9a31c12b9e633e60f SHA-256: 6578ecab80460631010fb7f4b25de3017260e90dde66ffe44bd87b3e3019226c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chafewyuok.handysociality.com/upload/files/zitinazatedabuxodu.pdf In PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109041851121036.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/lifugudasusug.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/tajefiri.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/suzulitewurulupewajubojo.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/rawujesegogojitol.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109080651437436.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630468535.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/jeguralurazikuxisav.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f9bc08699---38557292591.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/boxopabukiziguna.pdfIn PDF document text
    • http://bakoca.hu/files/file/sisaf.pdfIn PDF document text
    • http://livestocktool.com/d/files/18159368856.pdfIn PDF document text
    • http://samtekelektrik.com/files/51609471442.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/barozovodugizivafude.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/goxazebilejimuwe.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/mavovufodasujiteke.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/67387387649.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141639a5154d---83344306810.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210911234858704.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/11203616530.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/17655642750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+remove+spy+apps+on+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_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 10764 bytes
SHA-256: ff8dfba86899f7a39e68ae6c5532ba4ed96f554e4b575a633e97fdee5a9a203f
font_01_sfnt_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 17488 bytes
SHA-256: bb85b97495fb4f19b97867007fc1eae53cfdea8d53da3cb2c5c047f157e4fdae
font_02_sfnt_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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