Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c6e9e5f1d93f9f…

MALICIOUS

PDF

78.8 KB Created: 2021-03-29 05:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a951c41456cf9012509b7e4e5d00ae60 SHA-1: cce0994f922798680822bae3e641d5aaaabb58e5 SHA-256: 53c6e9e5f1d93f9f5ee1526f52ad4620825e8a32607c821939552df4dea51ac3
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs, with one specifically pointing to a URL that mimics a search result for a book. This suggests a phishing or malware distribution attempt, leveraging a seemingly legitimate search query to entice users. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/award?keyword=blender+cycles+materials+and+textures+cookbook+third+edition+pdf PDF link annotation
    • http://bunakevogipo.iblogger.org/behavioral_theory_of_depression.pdfIn PDF document text
    • https://gokidobizivoji.weebly.com/uploads/1/3/4/4/134495246/donejimedo.pdfIn PDF document text
    • http://sowinod.mywebcommunity.org/english_grammar_worksheets_with_answers.pdfIn PDF document text
    • https://sedovabopidixo.weebly.com/uploads/1/3/0/8/130813108/136351.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabudoxuwa/cggihhc/gamesomibapo.pdfIn PDF document text
    • https://burazukukoxuvi.weebly.com/uploads/1/3/4/0/134096138/2383619.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/types_of_analytical_balance.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/gjjqgel/walkthrough_chuchel_with_all_achievement.pdfIn PDF document text
    • https://zakekeru.weebly.com/uploads/1/3/4/5/134584110/vedubudigim.pdfIn PDF document text
    • https://cdn.sqhk.co/badexejos/jhgj6vh/first_aid_beauty_kp_bump_eraser_walmart.pdfIn PDF document text
    • https://jasefeneg.weebly.com/uploads/1/3/4/4/134489721/xegujatirod-negesufijudesa-muzunopilidudig-mitoj.pdfIn PDF document text
    • https://cdn.sqhk.co/pefatipi/jjcp5ge/road_trip_for_18th_birthday.pdfIn PDF document text
    • http://wotamojami.22web.org/jewovopidilonevumof.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/patotale/xagonozuvogudovinadozeg.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/49839857389.pdfIn PDF document text
    • http://bokawevetejap.atwebpages.com/rental_agreement_format_in_tamil.pdfIn PDF document text
    • http://zujugefov.rf.gd/womutegufowaxosiworivifu.pdfIn PDF document text
    • http://dojisurufam.rf.gd/29336423852.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/using_commas_worksheets_for_grade_2.pdfIn PDF document text
    • http://tuwogujizurez.epizy.com/tubimulokexob.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/excel_remove_empty_rows_from_sheet.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_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 5820 bytes
SHA-256: 6c31d99c0e37e782535f27c6c998abd688dc5256aa2f93698d4bf2582df2162f
font_01_sfnt_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 15096 bytes
SHA-256: c621c7e3e5bc64134b892e83d60436829ff07a6327053834da5804b19d6679f5

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