Malicious PDF — malware analysis report

Static analysis result for SHA-256 7964073f060297de…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 09:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed237a3e30eda001e0e2dddc01b96d30 SHA-1: 2547555c77427d1f4ec912ba6f40d22eca983da1 SHA-256: 7964073f060297de979c5736268e00aa8ce715c081dcb471c886e3be717cbf8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs that point to disposable domains, characteristic of a link farm or phishing operation. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to redirect users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://infrive.ru/uplcv?utm_term=root+fire+hd+10 PDF link annotation
    • http://dejede.com/userfiles/file/mebagegukigenigaza.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/88944183871.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/lomekar.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/majaxiliwimafimojivavek.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/kilusa.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/vegan.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/25617011269.pdfIn PDF document text
    • http://happy-land.hu/editor_up/tofixin.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/31979102600.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/82425791104.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613342ecb68bd---nemimegep.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/fulere.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/zuxopokomawamapetadujid.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/bosolopulanimaneni.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/juzopav.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/nujudabukosazirosivomoxom.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/67664487573.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/tezerawaz.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/835471664.pdfIn PDF document text
    • http://muszempilla.com/files/file/turefozotuv.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_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 10188 bytes
SHA-256: 40c8d0980e73784798ac79923ee5a3b2dd59ca98b7eea41aa3a0c9b90f489fd5
font_02_sfnt_off00010e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E48 18092 bytes
SHA-256: 4eed5b252e18c0848caec6edeb77244a2c8f04a5b48c9a30f1304ea9db9a9c44

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