Malicious PDF — malware analysis report

Static analysis result for SHA-256 9071d15d2e15cfe8…

MALICIOUS

PDF

84.0 KB Created: 2021-03-22 22:37:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35e629ae9d7033d3a5fd297dbbde8517 SHA-1: 65c705e52f6f9a8d97fbee57d4233f110387a9a1 SHA-256: 9071d15d2e15cfe8f48073c4673c06e8a26d5b2d6a657bd1ab65a486ce3632b7
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a site related to 'webwork answers cheat', suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jacksth.ru/wix?keyword=webwork+answers+cheat
    • http://fomijegi.mypressonline.com/marriage_and_family_the_quest_for_intimacy_8th_edition.pdf
    • http://wujejejifi.mygamesonline.org/what_is_flowchart_explain_its_basic_symbols_with_an_example.pdf
    • https://cdn.sqhk.co/kerutadit/idrhiDd/daxaxuwiveg.pdf
    • https://cdn.sqhk.co/wukatigubo/vjgzkie/garlic_smashed_potatoes_crispy.pdf
    • https://cdn.sqhk.co/wugeguxu/icYjjhj/driving_school_2017_game_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_bd29c157cd7249ea8d375fe102bcef1f.pdf?index=true
    • https://s3.amazonaws.com/vufupu/dan_kennedy_wvec_wedding.pdf
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_dc0a3f327bf64ed1943ae2c41ab03209.pdf?index=true
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_49e04dea798141ca9fc56d3e167a194e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0d44b98a-a8fc-4ab0-9994-7ec68935d880/backbeat_fit_3100_vs_3150.pdf
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_69313421d6b24f9da75157e628f6f8b4.pdf?index=true
    • https://s3.amazonaws.com/sitok/reported_speech_conversation_examples_with_answers.pdf
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_30d8255717544f3f92aad3e932af07fd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a4705e50-d6f9-4763-90a9-8e1fb20db80a/how_to_test_hampton_bay_transformer.pdf
    • https://s3.amazonaws.com/jafujasiwetid/nawojifaxidoko.pdf
    • https://uploads.strikinglycdn.com/files/3f63a52b-1f41-4291-ba01-39f4c6fba603/8487892003.pdf
    • https://uploads.strikinglycdn.com/files/a15fc670-d021-47af-9cc0-4e0e2a4d8b34/bepopevasedigezawir.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c76.bin
74bb7691f2d0c5dcbf17c35759f5b5e20e11be6ca9996887c0e6f900a97175f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C76 5164 bytes
font_01_sfnt_off00011e1e.bin
2c8b86bc9783bea4a0360b78409db5471db4e6e03309ba5b14ca15c48b345d09
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 10588 bytes