Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a412903ab7d5ea5…

MALICIOUS

PDF

75.1 KB Created: 2021-03-13 16:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 09968bcb09bfdda230f89a3f954a0c3c SHA-1: c5f402108d09498a9af23eb1d95b4285a345e079 SHA-256: 8a412903ab7d5ea516b7d167f45bc799d6ed0085b09d73b94182c5504ecdd4bb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://gimoguvi.ru/wix?keyword=2007+mini+cooper+repair+manual PDF link annotation
    • https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/libofuwepa_wagalijutolutas.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/94539737536.pdfIn PDF document text
    • https://lazofakivew.weebly.com/uploads/1/3/1/4/131406449/folitujo.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofigeniso/wXthhhn/mojabeb.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/ehgihic/first_strike_final_hour_free.pdfIn PDF document text
    • https://tofibozuliven.weebly.com/uploads/1/3/1/1/131163910/e37aee.pdfIn PDF document text
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/6597543.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/wejotusofa.pdfIn PDF document text
    • https://tetusujofejami.weebly.com/uploads/1/3/2/6/132695476/fubosogumusaribufex.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/25207489182.pdfIn PDF document text
    • https://xuwuperozaposa.weebly.com/uploads/1/3/2/3/132303395/7b267f52031a1.pdfIn PDF document text
    • https://pabebubi.weebly.com/uploads/1/3/2/6/132695301/tulavubewojogi_vunakowiwa.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/jaiaDZ6/brilliant_energy_reviews.pdfIn PDF document text
    • https://memuwumobodedo.weebly.com/uploads/1/3/5/9/135974490/fc57594dd74dc4.pdfIn PDF document text
    • https://kitigenuripoduj.weebly.com/uploads/1/3/1/0/131070171/3945731.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/toshiba_ct-90325_tv_bluetooth.pdfIn PDF document text
    • https://cdn.sqhk.co/podogule/igjfyD7/card_collection_display_stand_wooden.pdfIn PDF document text
    • https://dirifulezidume.weebly.com/uploads/1/3/2/7/132740871/8008754.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/how_to_turn_on_your_hunter_sprinkler_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84b123f1-6918-4908-a3b8-c3647a66d223/bazasepujokapuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/493ea70f-b8e4-488f-a173-0eeccc71cc9d/ipad_mini_2019_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60186b83-5f45-4fe1-b507-52df966fcc53/21648571112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8333773-6564-494e-a3a4-b950db4c3727/where_is_usps_customs_located.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_off0000e848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 5160 bytes
SHA-256: 31c946f469c2ec0b604ac96395703eab10a1c3ee441697ea210a3b5bf14a8e02
font_01_sfnt_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 11036 bytes
SHA-256: c1c185e4310348d9da561a0d6e958d007df8eebda2c61ece214443052641b87d

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