Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff9580448914174…

MALICIOUS

PDF

77.8 KB Created: 2021-03-27 10:08:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fb49bf67cc9cb2290147c2ca569c3ccf SHA-1: 24639260f1a30bea8ca120fe0378b242fdabe149 SHA-256: 5ff9580448914174d6e77990b1a946cd0f3dd446439acf981962170b2bd3befc
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/award?keyword=analytical+separation+methods+pdf PDF link annotation
    • http://punavuvipufov.sportsontheweb.net/vorazoverudilivop.pdfIn PDF document text
    • http://wosutopanoba.mygamesonline.org/basic_architectural_symbols.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/ifha6WI/netflix_account_login_history.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402297/normal_60437ec8f166c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_6009e71a0ebf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5fe87b2773fb7.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CtjdgtM/fast_money_halftime_report_cnbc_fix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382413/normal_5ff2b95220040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_6049ae80bef02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413458/normal_6024391767aa5.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/hjjcXjj/senior_easy_phone_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483591/normal_5ffbf9f584170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468540/normal_5fd2c318aa479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445729/normal_60504c463a187.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/A7phdif/yeast_plasmids.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391327/normal_5feff3049c3d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/cisco_basics_of_networking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/015946b9-aa7d-4868-819d-0ca37fa80b8f/diary_of_a_wimpy_kid_double_down_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e695473-7fe5-45d1-8c9d-8f335472835b/how_to_brighten_a_dark_room_rental.pdfIn PDF document text
    • http://bilofudako.onlinewebshop.net/gipibifategizaven.pdfIn PDF document text
    • http://situwosase.myartsonline.com/nys_court_officer_exam_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6acc525d-6a14-4b4f-8ad2-1fc579c6befe/best_multiple_streams_of_income.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52b2aec-551c-4faa-8b9e-c2597e241d54/32008739420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4236a5a-7c3e-45c6-ad86-2883f8284bb3/bemasuvotawavisuvuxubidal.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_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 5484 bytes
SHA-256: ba2ef951fe114be94ecff9aedd712acb6c488972d0d45f59d1524e8fd98cb7ab
font_01_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 11268 bytes
SHA-256: b92102b77e603fcb6e63230a6dfa6b1b7dd599cb698b32362604f4cd14b6e185