Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7d79d1dd8bf32c…

MALICIOUS

PDF

75.4 KB Created: 2021-03-27 10:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 621b62129e930b0c10066c2fa75e9ecf SHA-1: d42d0ffe59ffa6e44b99287dd5451a800c8a00e4 SHA-256: ef7d79d1dd8bf32c55756c60d4bf79b33c67e2f7be3c20a103be722e4f294d22
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to external domains, including one that appears to be a link farm designed for SEO manipulation. The presence of these links suggests the primary purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/wix?keyword=taylor%2527s+video+guide+to+clinical+nursing PDF link annotation
    • http://bitjoms.xyz/catecismo_de_la_iglesia_catolica_vaticano04bs1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_604d1b80f41f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497110/normal_5fe411af3cc79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_602a174a85685.pdfIn PDF document text
    • http://autobuff.xyz/acrobat_dc_freezes_windows_10q2wbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487897/normal_5ffbfba41fd53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479236/normal_5ffcdc1252850.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383929/normal_5fc56de60b488.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369302/normal_5fdcf0f6e1a0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449622/normal_605d8ed07eac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483870/normal_601e2bd4da1ab.pdfIn PDF document text
    • https://cdn.sqhk.co/rawewosit/jjchegn/catalogo_viemar_2012.pdfIn PDF document text
    • http://lezapogogaz.iblogger.org/best_interior_design_apps_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/surekepuna/jcTjgqV/andover_middle_school_uniform_colors.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/eg4aW8D/26094358275.pdfIn PDF document text
    • http://merovew.xyz/rusted_warfare_mod_pack_download8tnc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425910/normal_5ff906b9815d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_6013e420ebcae.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/hgjjiie/paper_plane_glider_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402478/normal_6021c050869ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kudetewususitup.rf.gd/20936839103.pdfIn PDF document text
    • http://bopexetosezulav.rf.gd/crystal_reports_for_visual_studio_2008.pdfIn PDF document text
    • http://modedavap.epizy.com/completing_the_square_practice_5-7_answers.pdfIn PDF document text
    • http://dimegebewode.epizy.com/qpr_v_ipswich_match_report.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_off0000ea7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 5252 bytes
SHA-256: 99ef2c7b67a88ad433da0792102d700197cad1bed5ced8e04a9ddf4d15046b6a
font_01_sfnt_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 10480 bytes
SHA-256: 62b529bb9f6f81d1dd479f37f7b93f0679c7b3d0ac6bbe7a420284a300a231a3

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