Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03ba97ed20f6774…

MALICIOUS

PDF

84.2 KB Created: 2021-09-23 05:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d2759d7bec8ad25a8b8448e981c4ebb2 SHA-1: f027f3148fa819143aa69d005bad71657aafa3c8 SHA-256: a03ba97ed20f677430c7ef7180db84c58664ff00f380b8812096b23ff22d9dc5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of using disposable hosting for link farms, commonly associated with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.scea.edu.mn/ckfinder/userfiles/files/25971187552.pdf In PDF document text
    • http://trans-serwis.com/userfiles/file/miwimapoko.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/50390629764.pdfIn PDF document text
    • https://rotitelor.com/contents/files/batakoxobowiwilegeminoj.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109100823076718.pdfIn PDF document text
    • http://centronegozi.com/public/67470079954.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/jasumurow.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/12454896520.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/73417430378.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/14689605074.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/22171299257.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/68015987320.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lurilexajaweb.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/bazimu.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/65261665647.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/mugevimelifoxufezewe.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109151554004857.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/6180622998.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/15049992515.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/fuvarikojunupelagiwipumas.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/33050558504.pdfIn PDF document text
    • http://bankerz.in/qpic/files/robizakatoretekutifiluv.pdfIn PDF document text
    • http://ukrfirework.com/images/file/pubomik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+android+app+for+gpx+filesPDF 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_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 18112 bytes
SHA-256: 2c126cfd87b2341c8cbcb175dac22e436c814bd7930986a018abad91ef8a9bc7
font_01_sfnt_off00011093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AA 10828 bytes
SHA-256: 7a9fa8cb79b64dcdd246a271a284110dbcb765c83bef48efcac32554ee1dfd73

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