Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e4ec2c8be9e2d1…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 10:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dcf832b3d81b0d15c4b2926cb138cab6 SHA-1: 00d858b75d4f550884bc06c4ab6fedf2b9a9cf85 SHA-256: 72e4ec2c8be9e2d1aa2cd8e8c678120a1ffeb7598f6b6e43c195addf1820ea8a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic specifically flagged it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the 'callback phishing phone lure' heuristic suggest a phishing or scam attempt, likely to redirect users to malicious sites or collect information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://synerhu.ru/uplcv?utm_term=password+remover+in+pdf PDF link annotation
    • http://sinsg.com/files/fckeditor/file/mitipelabamulud.pdfIn PDF document text
    • https://stotex.rs/files/55616720426.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/73406369714.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/1047172399.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614194aacaefa---sagex.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/63795035250.pdfIn PDF document text
    • http://riph.pl/userfiles/file/zipideniwuwabuzixigim.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/jalesobimavakonetoti.pdfIn PDF document text
    • http://ashioke.com/images/library/File/33864562860.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/lezebaxigox.pdfIn PDF document text
    • http://www.puhito.hu/uploads/baruzomipaj.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/145561003.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-7/20210907000530102696.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/28423235778.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/wudexafigasajodagobazof.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/dexunotim.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/xilunabosutafuzugurevis.pdfIn PDF document text
    • http://www.springperfect.com/upload/finder/files/4682494003.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/xeguvujarafezikan.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344de5c66a2---85756713755.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/mexiriwomoduruzoratafaluf.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/zetigaxiferoz.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_off0000be6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6B 17172 bytes
SHA-256: 3a8ec1bf6bf05ba61a3caf595be87afc49ab9eca66b2055a458855412948be0a
font_01_sfnt_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 10668 bytes
SHA-256: 5ae513fe1276a086c23879183964e1d5aabe0a19f4375f06f06172802a31abd1
font_02_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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