Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a091d53393668f…

MALICIOUS

PDF

87.5 KB Created: 2021-02-27 16:49:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fbf1ee84a55c3f03598ed0e9cc1a8b6e SHA-1: 09c56a85f0c5228420b95896f5c1ae207c36b167 SHA-256: 75a091d53393668fa8f46237419c087f56f51a2b67986b626a2ddf58ce1cf812
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=pokemon+books+early+reader PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403954/normal_5fd77b6f342d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420036/normal_60013a5cd46c1.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/fggcTjf/raspberry_jam_canning_recipe_with_pectin.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidazi/jT5ggjb/67640281939.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/hjMhfih/sawemu.pdfIn PDF document text
    • https://wokulenazaxur.weebly.com/uploads/1/3/4/7/134744474/bupuborefopodefesew.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/eaZ5ljc/580_words_2_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/bhjggSt/final_order_card_game_digital.pdfIn PDF document text
    • https://cdn.sqhk.co/nowagenika/ijjipvO/go_transit_ticket_machine.pdfIn PDF document text
    • https://zijepujalikok.weebly.com/uploads/1/3/1/0/131071164/mupeni-sozoxan-banaluw-fololibepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_600bba9a4f4fe.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/eL1IJji/faily_skater_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/dalogunutixo/2XiinTW/formula_1_monza_2020_results.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/dhdLjjo/download_mini_car_race_hot_wheel_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/3jaIx5e/minecraft_java_edition_download_code.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/jazuravazaguz/28508895231.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/cpr_guidelines_1980.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/suwixivenuzozuvanol.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_off0001198d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 5276 bytes
SHA-256: 1f6d0bbb2f00c73d1a702f461cf67b6782cfa1811b764e63bdffc45dd360efe1
font_01_sfnt_off00012b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6B 10888 bytes
SHA-256: b1779320d555377a78ea9e143396e0fb519c8f5d328ac35a2ee707a272748ba4

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