Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab343ab5505c4740…

MALICIOUS

PDF

80.0 KB Created: 2021-03-15 03:25:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 03d3b7763a3400b55e07ac7f985ef4f3 SHA-1: 878f27b5153f65684567277b4da2705a3b17275c SHA-256: ab343ab5505c4740af76da945af257a9a4d025951871a41dc65fb3f2f1a1d97a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of a lure to external malicious content.

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 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://mezovuduw.ru/strik?utm_term=sennheiser+ew100+g3+radio+mic PDF link annotation
    • http://gexulogoben.sportsontheweb.net/tratamiento_de_blastocystis_hominis_en_nios.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/ibogghc/mabutugozim.pdfIn PDF document text
    • http://insta-sale.site/what_is_the_best_rhythm_heaven_gamev5yhc.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexufi/jagd6jX/17728628568.pdfIn PDF document text
    • http://kefudepoduwudi.sportsontheweb.net/1257157792.pdfIn PDF document text
    • http://firstdoctor.xyz/261225159203knoy.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/80529160771.pdfIn PDF document text
    • http://helpcreditscore.info/78520958806kwg93.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/monobekiwoto.pdfIn PDF document text
    • http://losqutoq.online/guide_words_worksheetq9lu9.pdfIn PDF document text
    • http://tesocoin.online/37860092082moajz.pdfIn PDF document text
    • http://gusevoxuzuwelap.mywebcommunity.org/piseziga.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/swzhigf/roniwenimazoduvepix.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/arabic_letters_activity_book8m01n.pdfIn PDF document text
    • http://zelopaqq.xyz/990135643801wai5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/341f3823-1da7-435c-9419-01c34b34abaf/2000_ford_ranger_transmission_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642aeebd-0bf5-4d08-9e8c-3d8ee4554dd1/sherlock_holmes_list_of_stories_in_chronological_order.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/44984152206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38cbf10d-d583-4de9-8f6b-d9f7dfcf6f31/harry_potter_butterbeer_recipe_starbucks.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_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 5876 bytes
SHA-256: f6b79f1c3d7e67143f4ccb99a61eaf43349aada35f2d89c80cf770c75ada936f
font_01_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 12060 bytes
SHA-256: f227a2c188ea8510b270ae064a1881358f7fe5353088280e30586c014dbbc1e8

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