Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f98cc965750d91…

MALICIOUS

PDF

75.0 KB Created: 2021-03-20 20:07:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3176fd56838e0e540e93b11517501a43 SHA-1: 553deb2c88263f5d7978e738327c3e9ca3e61de8 SHA-256: 64f98cc965750d91d6c35b720da331ae9deb5c512f73ca94215f66f22aa25c4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a deceptive title related to web development, likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/award?keyword=basics+of+html+and+css+pdf PDF link annotation
    • http://getporte.xyz/how_to_change_camera_resolution_on_iphone_873pap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391327/normal_5fcf29a332b50.pdfIn PDF document text
    • http://internet-babki.ru/sifepiwuzezaga3rk03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461766/normal_60137aeb31fee.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/mefopiratesampwghg.pdfIn PDF document text
    • http://genoray.pro/60401373349rlrsq.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/bajamafat.pdfIn PDF document text
    • http://betmoy57.com/appointment_in_samarra_maughamrdbmh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_6049686420222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446158/normal_604f53aa579b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wemaxoseni.myartsonline.com/tetugefofewosulu.pdfIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_ade40be7ce364dce89af20dce0af4d8b.pdf?index=trueIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_b5458a78a9f54c1aac3d459ee1800412.pdf?index=trueIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_013f822051a2497e8f1e5406364a9d06.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/debiwelof/23248807885.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/saffron_walden_reporter_news.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/les_berceaux_gabriel_faure_sheet_music.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 5348 bytes
SHA-256: df4339c621547ad43cc0d90f2e7c39eee72cb228faed5b58b39f32351b4aab1d
font_01_sfnt_off0000faa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 10640 bytes
SHA-256: bea6288ac1337ff4909e4b561b3e2f26a5ae6b429a002602ab4f7e798e7e5210

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