Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cedc71b7f3c79be…

MALICIOUS

PDF

80.6 KB Created: 2021-03-04 01:39:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 54ae458d47841a24db1afb186e203ada SHA-1: 6ac8f42a35c865e6d77577d9345e99d063b799e8 SHA-256: 4cedc71b7f3c79bef067c8ba087043b873f8af338ce522e6cdee358f32a76989
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated and point to other PDFs, indicating a link farm or SEO manipulation tactic. The presence of a URL with a keyword suggests a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or malware distribution.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/wix?keyword=victor+parks+and+rec PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482020/normal_6000b24fc64e2.pdfIn PDF document text
    • https://divewamekavese.weebly.com/uploads/1/3/1/8/131860060/jukasitodexazu.pdfIn PDF document text
    • http://retamos.mygamesonline.org/us_navy_flight_training_aircraft.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/gtwSrZf/spill_it_out_lyrics.pdfIn PDF document text
    • https://pagafamowadaf.weebly.com/uploads/1/3/4/8/134878907/taxutiba.pdfIn PDF document text
    • http://gosepakaf.getenjoyment.net/jamikukisisagi.pdfIn PDF document text
    • https://cdn.sqhk.co/bedazume/jfighhc/idle_heroes_tier_list_july_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/koletexun/Rhgidhb/fixunakuregozad.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/how_to_scan_from_hp_4630_to_computer.pdfIn PDF document text
    • https://repowuvosifopel.weebly.com/uploads/1/3/6/0/136050091/mifulememoniron.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/hc8esha/hockey_stick_growth_chart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tokit/47725950087.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/bruce_schneier_applied_cryptography_2nd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/jemajegobuxora.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/iifa_awards_2019_link.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/22256332248.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/asure_id_7_software.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/android_studio_theme_plugin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 5064 bytes
SHA-256: d773e9818e82178674c671f65574623fd6ea6ecf6633246b259b8d7ec8d4291c
font_01_sfnt_off0001051c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 1876 bytes
SHA-256: 5f253fa7c3d91980460d014a67c32437e14d5c2947e17669986eb648630747bc
font_02_sfnt_off00010e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2F 10848 bytes
SHA-256: bb1e1c6a2d4c43005876f9b6de049a9560d064cb080a988fc3cb0633d0c1d3fa

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