Malicious PDF — malware analysis report

Static analysis result for SHA-256 f726a0462bdb5bbf…

MALICIOUS

PDF

95.0 KB Created: 2021-03-16 07:55:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0373646493b62257fd074f8b0b4b525d SHA-1: db6f8adaa97f56ff4c4c249bce3e4469664b8bcc SHA-256: f726a0462bdb5bbf8ac0fbdd0d1d93574f3a8fa80d09b9f27299ecae07046721
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://kuzutuzo.ru/wix?keyword=sniper+assassin+unblocked+at+school', appears to be a lure. No scripts were extracted, but the PDF structure itself facilitates the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=sniper+assassin+unblocked+at+school
    • https://cdn.sqhk.co/noperizapewo/ihhdfgc/real_stickman_crime_2.pdf
    • https://cdn.sqhk.co/vorinugobol/gfsbjcJ/zosafaxuwefonedabolu.pdf
    • https://cdn.sqhk.co/sujubowip/gdjedTj/ping_pong_the_animation_op.pdf
    • https://cdn.sqhk.co/tefozakozup/f3hdngh/nbc_sports_gold_app_samsung_tv.pdf
    • https://cdn.sqhk.co/lididiregi/gcigSgg/counting_numbers_games_for_toddlers.pdf
    • https://cdn.sqhk.co/rawavuzom/jPVRDk1/80211338929.pdf
    • https://cdn.sqhk.co/tubawonidas/fQibjaa/study_skills_for_high_school_students_with_adhd.pdf
    • https://cdn.sqhk.co/jogekiluse/lGUKih4/transfer_data_asus_ke_pc.pdf
    • https://cdn.sqhk.co/fixefalid/ujeimvd/fozaforerivet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/83c8f7fe-92bd-486a-b515-271cc6295ae2/19942613929.pdf
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_ab563f530a644767aea28ba4a762886a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/35de2af8-5724-4803-8cde-fe87c89f85b5/dungeons_and_dragons_5th_edition_character_builder.pdf
    • https://s3.amazonaws.com/fofeguj/biomedical_engineering_project_topics.pdf
    • https://uploads.strikinglycdn.com/files/4883a377-927f-4723-bad4-71527659ca97/malezupegep.pdf
    • https://uploads.strikinglycdn.com/files/ebcab7b7-d11f-4435-a934-f62b9def21bb/common_core_math_learning_progressions_chart.pdf
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_f2e95993b38b4350ba0517cfbe5c1d07.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e44fe089-887c-4fd7-ab04-babee1990e16/gakedifosuvipi.pdf
    • https://s3.amazonaws.com/dixaleko/sub_zero_ice_maker_cleaning.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b4b.bin
768e0da1b000ece4cd1ac4c7303dbd4289615686a86ed0a790e8a6142102ab7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4B 5468 bytes
font_01_sfnt_off00012dcd.bin
9248eccbdd32bcc98c9e8860258b2f17a954694d15840ade4b50a9ff03f45d92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCD 13468 bytes
font_02_sfnt_off00015972.bin
35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15972 16036 bytes

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