Malicious PDF — malware analysis report

Static analysis result for SHA-256 139719c5db5339df…

MALICIOUS

PDF

91.8 KB Created: 2021-02-15 23:07:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1f9ff573c4597041ec151f20e7d40798 SHA-1: 085e3cdc11fa44c56ca15792cbf24fa93b37686c SHA-256: 139719c5db5339df20bd89741813b9401b812a29e79df9553be66e1ab7915849
146 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious phishing content. The 'SE_CALLBACK_LURE' heuristic specifically indicates a callback phishing or tech-support scam pattern, where the user is prompted to call a phone number. While no scripts were explicitly extracted, the presence of many external links suggests an attempt to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wb?keyword=michel%20foucault%20space%20power%20and%20knowledge%20summary PDF link annotation
    • https://lividuxu.weebly.com/uploads/1/3/4/3/134354071/tubomot.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/pIy5jbD/sticky_blocks_game.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/korean_journal_of_management_accounting_research91gk6.pdfIn PDF document text
    • https://cdn.sqhk.co/wavivatus/tggsjcI/at_t_mobile_transfer_contacts_not_working.pdfIn PDF document text
    • https://pekamadepo.weebly.com/uploads/1/3/4/3/134321673/wuzivo.pdfIn PDF document text
    • http://tosety.xyz/utorrent_music_albums_2018r0i4g.pdfIn PDF document text
    • http://mklhhhh.space/67584738398mcyt1.pdfIn PDF document text
    • http://table-wait.com/kazubuginq1ug.pdfIn PDF document text
    • http://gufutaca3.xyz/accident_reports_nc_state_highway_patrolr8kmw.pdfIn PDF document text
    • http://pay-order.info/star_wars_age_of_rebellion_character_sheet62ymq.pdfIn PDF document text
    • http://reduslim-eu.site/c_language_mcq_questions_with_answers03xmn.pdfIn PDF document text
    • http://thedefenseforge.com/nodililibosrejxf.pdfIn PDF document text
    • https://xorizelipuv.weebly.com/uploads/1/3/1/6/131637744/fevivuvenu_pefovelut_wibozusitumojat_raragudir.pdfIn PDF document text
    • http://vifijes.22web.org/balu_mamachya_picture.pdfIn PDF document text
    • http://imedo.ru/855322687056ta05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://voderekop.rf.gd/41254592128.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_off00012850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12850 5832 bytes
SHA-256: 38b32337a741ef6e32f923ff27687fed9adbae4ee15b5419829da3d52533158b
font_01_sfnt_off00013c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2B 11436 bytes
SHA-256: a50446ab5d3990134f568f1a8173487e817e753d0aa0c9adef5804599efb6527

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