Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d80eba9414cb37c…

MALICIOUS

PDF

85.3 KB Created: 2021-03-01 20:07:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 896783389fc948210a4575b9e5520754 SHA-1: 739bcccbc5f508fa6fa91506dd0c3cf9fec7dfe0 SHA-256: 5d80eba9414cb37c2470a3cd73ac4787b7690ae7dc418b9adf4d5a0aef7684aa
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high malicious score. It contains numerous external links, indicating a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the primary goal is to redirect users to malicious external sites.

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://baarspo.ru/aws?utm_term=computer+hardware+parts+and+their+functions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422392/normal_5fcec1873506b.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/hjgeOig/parentvue_mcps_link.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/jc0Fhhq/strategy_meaning_in_tamil_example.pdfIn PDF document text
    • https://kutesavakelex.weebly.com/uploads/1/3/4/3/134336058/5747675.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380226/normal_5ffe643c90a02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373511/normal_6029dec682dda.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/ggjdmI3/idle_defense_tower_combinations.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/ijQidgj/recargar_claro_pr.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/gjjcEjj/okra_in_spanish_puerto_rico.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/metubevozisul/excel_vba_set_variable_to_column_range.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/manual_versus_automated_testing.pdfIn PDF document text
    • http://xologikaju.atwebpages.com/common_pharmacy_sig_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/fogosuzuzulagigi.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/farming_simulator_2015_best_maps.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_off00011123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11123 5360 bytes
SHA-256: d578041e22139180b9717c666a3f7004f558e4097c95edf124b42f15d55ce9b2
font_01_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 10844 bytes
SHA-256: d0cc1e5ec1fe0b934ec3bdd49de5f5395b05f5bf9bae11024cd9af23d2d853f7

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