Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a2e2e3f226e847…

MALICIOUS

PDF

71.9 KB Created: 2021-09-12 14:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1a5e11c13380b5585a133e86292ece0 SHA-1: b24d75c7b2607a99498d18af9ba87b46c15eb03d SHA-256: 85a2e2e3f226e8477d71b45fbef1fd4eee13556d7df4135dad06e92ea9aa48b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious sites. The PDF structure and embedded URIs strongly suggest an attempt to lure users to external content, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=purple+smart+tv+app PDF link annotation
    • https://edusfera.pl/upload/file/fumorumitimumabe.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/92592780845.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613baee733add---42131603183.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/77353582741.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///60839059205.pdfIn PDF document text
    • https://khanikango.in/file/vugozimipowesivijorepelad.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/xazipexuxarij.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/tumugoxijuler.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/65642375983.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/17211520251.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/74377339774.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/12221848269.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/zaxotasiwarujovub.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/15802779718.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/gerifawixewazukiwajitoloz.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/menagedokabaxukorijido.pdfIn PDF document text
    • https://coluer.ir/documents/file/zajugifasixakawegajo.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/25488432108.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/62290514938.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/21772968388.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/wukuzemalatufozerufovazi.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/54604000948.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/58887525059.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_off0000b69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69A 17196 bytes
SHA-256: 7a43354ce1938508a7ed5ce97d87c11e1f7c5e419a7d519def3257579c692f88
font_01_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 10264 bytes
SHA-256: 7c489b463a129ce55d13ada5138c8b59d45ff1655275eb9db5af2cccdf8202d0

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