Malicious PDF — malware analysis report

Static analysis result for SHA-256 954c0251104bfa8b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 20:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ce1fcb1f8fe698bf1601511ffaeaff47 SHA-1: 0325888f7cfa8c40d83c72e24fba6d4aa6086e26 SHA-256: 954c0251104bfa8bd73e7ff57296c0e2e17280247a69314f610e03aa72d3f1cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ML and ClamAV heuristics strongly classify this PDF as malicious, likely a phishing or trojan delivery mechanism. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities or social engineering to lure users to external sites.

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 https://philabc.ru/uplcv?utm_term=drinkable+alcohol+chemical+formula PDF link annotation
    • https://fengshan-zhennangong.org/upload/ckfinder/files/24714579438.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/11406475461.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/melelalutagaxo.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/xumabedokoputefuxil.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/toresokijezejuvijasa.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/10854935876.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/3008689518.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/64840181193.pdfIn PDF document text
    • http://th-hl.com///upload/files/18522242105.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/71825601673.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210911120529668.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/62588885697.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/22755961474.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/24097227392.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/meworubelarizafuzebux.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/90675265810.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/614072bca65d8.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/57543042004.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/lumis.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/50394917413.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/fijotolulufi.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/vusuzanoridusasak.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/murolelekekevuzezu.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/4333dbb0195ad46fc9d4e47d52e4286f/venoveroludazovaxubolol.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_off0000d336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 10668 bytes
SHA-256: 158bf2e256d9133de003112530baf0b67437af6e72df365d176627470c99b77c
font_02_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 17220 bytes
SHA-256: 56abcec56b65b29c7429ada4a22877dd1c650747ee4459473b26fde75cad2a47

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