Malicious PDF — malware analysis report

Static analysis result for SHA-256 9505e72ce1210d38…

MALICIOUS

PDF

71.7 KB Created: 2021-03-09 23:09:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1ea22620f734ba571cbced2994553dca SHA-1: 40159a28658bffec99ce22fe9ae2d17f178d40ca SHA-256: 9505e72ce1210d38f786fc88773412200c04590e53e60994593e9708d4a8a267
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to suspicious domains and one specifically flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the heuristic firings and URL analysis point to a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=norstar+m7310+phone PDF link annotation
    • http://alexsaf.ru/aslay_ft_alikiba_mp4mnrjy.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/975209eaf68de0.pdfIn PDF document text
    • http://kadabafomelu.66ghz.com/tuliribisogovi.pdfIn PDF document text
    • http://formulamoney.top/55127607374o4vza.pdfIn PDF document text
    • https://gusupaserilobe.weebly.com/uploads/1/3/5/3/135312632/3d6051d0.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/76359730301.pdfIn PDF document text
    • http://nadahul.ru/upward_spiral_definition886m7.pdfIn PDF document text
    • http://pegijegur.mygamesonline.org/casio_watch_aw-80_manual.pdfIn PDF document text
    • http://orehi-siberian-force.online/xapigijibedigokugejupadat7vbsl.pdfIn PDF document text
    • https://nafejodibema.weebly.com/uploads/1/3/4/3/134318188/637b0799e727.pdfIn PDF document text
    • http://wiroban.22web.org/vizio_sb3820-c6b_2.0_sound_bar.pdfIn PDF document text
    • http://egosikenclub.com/714604635tgs41.pdfIn PDF document text
    • https://supenavasude.weebly.com/uploads/1/3/5/3/135397397/woropagovewof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sakikuzugodo.rf.gd/vabilujevumivuxekewoluwo.pdfIn PDF document text
    • http://netawuwimirixor.onlinewebshop.net/best_funny_political_quotes.pdfIn PDF document text
    • http://widefafibix.rf.gd/investor_field_guide_books.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/carbohydrates_importance.pdfIn PDF document text
    • https://43a98339-0465-49d0-a416-8cef4780896f.filesusr.com/ugd/89258f_f3e284b928404990b99e0b4e381fbe3a.pdf?index=trueIn PDF document text
    • http://bukixusip.epizy.com/59448824182.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/bhavesh_joshi_movie_hdfriday.pdfIn PDF document text
    • https://a4067306-84c0-45ce-9c36-3cbb795fcb37.filesusr.com/ugd/d5b970_055fea30abf54a52b7c0817ec6beba35.pdf?index=trueIn 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_off0000dc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC64 5436 bytes
SHA-256: cd9268286e41f2d644bac280efcf194439780abb77d642919f14cb4bf458b38e
font_01_sfnt_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 10268 bytes
SHA-256: 8c2c145f6c9776fa18b0b297e9edbaf27a656861e021e96a9a5e88ce1abe134e

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