Malicious PDF — malware analysis report

Static analysis result for SHA-256 405f254ebf67fd06…

MALICIOUS

PDF

77.4 KB Created: 2021-03-17 03:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17a2d91009a4b77c4eb1862e8b88e7b2 SHA-1: 2b9aa4e468bd2e49b43e35483b732f1582063f6f SHA-256: 405f254ebf67fd06b1a8236da0c4e154a086848beb562097a2b44e1cab71a678
164 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier flagging it as phishing. The presence of a large number of external PDF links, including one pointing to 'seumenha.ru', suggests a link farm or phishing attempt. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into clicking a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/award?keyword=characteristics+of+computer+assisted+instruction+pdf
    • https://cdn.sqhk.co/vafodagusun/GWhidhh/34060142262.pdf
    • https://cdn.sqhk.co/bimonabozo/wQhhhiI/apk_driver_simulator_mod.pdf
    • http://zomuregunaradu.iblogger.org/vopidurufazu.pdf
    • https://cdn.sqhk.co/runetonorox/hfiaCjb/wheel_size_guide_mountain_bike.pdf
    • https://cdn.sqhk.co/xibetevoxaj/ajbpPja/5639517235.pdf
    • http://xilelul.iblogger.org/what_are_the_dimensions_of_a_football_field_goal_post.pdf
    • https://cdn.sqhk.co/kevekelobivo/eOjbihz/donkey_kong_3_mame_rom_download.pdf
    • https://cdn.sqhk.co/vomuvojovi/bEgehiW/jobemesafizaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_b47d66db746f4fc88918121821e97385.pdf?index=true
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_2b83fb2727a44b418b95eae462ff1294.pdf?index=true
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_89ab74c7ea6f4473b7ed8750a898b6e2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6041096c-cf66-4622-8b5e-cb8d6c253181/tamucc_electrical_engineering_degree_plan.pdf
    • https://uploads.strikinglycdn.com/files/da34f2f9-151e-4a9d-893f-91a96a3e4b90/tiwak.pdf
    • https://s3.amazonaws.com/siwixomudit/vatotuzutafadobelobodufap.pdf
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_b2b829835cc24c73b69c51002ce11d63.pdf?index=true
    • https://s3.amazonaws.com/lomiwexuva/gene_annotation_in_bioinformatics.pdf
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_193db5eb88bf41e7a31609968d292220.pdf?index=true
    • http://lebozid.epizy.com/zulosogiz.pdf
    • https://s3.amazonaws.com/dinilederu/cryptic_crossword_with_answers.pdf
    • https://s3.amazonaws.com/zalisujezajaje/simon_companys_year-end_balance_sheets_follow._1_debt_and_equity_ratios.pdf
    • https://s3.amazonaws.com/fapaga/insurance_business_analyst_interview_questions_and_answers.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_off0000f39c.bin
4e888f04e81e774f035b971c242b528847dd779ee1655052a66c821482cadcc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 5268 bytes
font_01_sfnt_off00010556.bin
4356071ee8b3e9acc7f0eb30ce1337034447b26dd9fcce250e5ac89acceeb0a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 10352 bytes

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