Malicious PDF — malware analysis report

Static analysis result for SHA-256 033912614a20e9c4…

MALICIOUS

PDF

70.1 KB Created: 2021-04-20 00:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7d75fcd8c64641b745555c3d19af874e SHA-1: 2714766587c7928bb4f57457b07d1794c97bfa6a SHA-256: 033912614a20e9c432be5d278970e91e7bf95dd28bb4dd80b4c0d122468bc720
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' suggesting a deliberate attempt to create a link farm. One of the primary external URIs points to a suspicious domain, 'midufefew.ru', which is likely part of a phishing or malicious content distribution scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://midufefew.ru/strik?utm_term=sharp+aquos+issues PDF link annotation
    • http://zedakobogesa.mypressonline.com/ropezikalukuvaniza.pdfIn PDF document text
    • https://sezijaxafiv.weebly.com/uploads/1/3/1/6/131637080/xonipok_gopopuvabar_figitosurali_gexelibigurab.pdfIn PDF document text
    • https://zavisedifigi.weebly.com/uploads/1/3/4/3/134316550/2232685.pdfIn PDF document text
    • https://tarakemutelomul.weebly.com/uploads/1/3/2/3/132303353/rarikowitonulopad.pdfIn PDF document text
    • https://nenawobu.weebly.com/uploads/1/3/4/1/134131353/8b026c0c.pdfIn PDF document text
    • https://supagerafigi.weebly.com/uploads/1/3/0/8/130874211/tenezanojajabuxe.pdfIn PDF document text
    • http://zupuvotan.22web.org/is_white_tiger_real.pdfIn PDF document text
    • https://xizejaselaz.weebly.com/uploads/1/3/4/3/134357450/dilon_denev_kepabi_zofarugusekikan.pdfIn PDF document text
    • http://faxusigeroles.sportsontheweb.net/63698642192.pdfIn PDF document text
    • https://senevabitup.weebly.com/uploads/1/3/4/2/134234896/beduletumiruzunufes.pdfIn PDF document text
    • https://dawukobisoxewi.weebly.com/uploads/1/3/4/0/134040495/4727904.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiwazojugumume.epizy.com/days_of_the_week_in_spanish_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/praktan_bengali_movie_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/48654026138.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/ielts_writing_task_2_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/platicas_bautizo_chihuahua.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/dd_adventurers_league_season_9.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_off0000d4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BF 5104 bytes
SHA-256: 594fc64315c81fbe7b1ec541c9b058f1e5aa3c0285ef1e647fa678fa7a133343
font_01_sfnt_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 10596 bytes
SHA-256: 9c0415b082fa98a88bc03816d654b9131e5351a35f6b5d229cec2e95653e08b7

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