Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f64c1fd08d9048e…

MALICIOUS

PDF

75.4 KB Created: 2021-04-03 12:39:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 8b64477856b0dacb239b11ce7ba10430 SHA-1: bc3b2868a0a90b42eb5df1cf1b5f2a5bffae5f3d SHA-256: 9f64c1fd08d9048e61178177fa722fb7a52d41d9e57fbde8a37cfc18e405d5a0
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/aws?utm_term=digital+clock+face+template+printable PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391620/normal_5fff3a245f6f5.pdfIn PDF document text
    • https://ropidofizo.weebly.com/uploads/1/3/0/7/130738616/d06ad88c09f2.pdfIn PDF document text
    • https://sovawetozinunur.weebly.com/uploads/1/3/1/4/131407226/tekamoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_6022bba412413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460982/normal_6034289831e53.pdfIn PDF document text
    • http://jotetifijenosif.iblogger.org/xefurokakilodowutujexuli.pdfIn PDF document text
    • http://relodifalixogo.scienceontheweb.net/further_mathematics_for_economic_analysis_solution_manual.pdfIn PDF document text
    • http://salimom.mygamesonline.org/bihar_si_previous_year_paper_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_6049e239cef00.pdfIn PDF document text
    • https://nevedafixi.weebly.com/uploads/1/3/1/3/131398567/1885712.pdfIn PDF document text
    • https://ratojomivufal.weebly.com/uploads/1/3/1/4/131453965/moder.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/auto_ingles_para_principiantes.pdfIn PDF document text
    • https://nipifofopofeduv.weebly.com/uploads/1/3/4/3/134338269/merusisosegi.pdfIn PDF document text
    • http://xivitej.66ghz.com/zisabevizipoborafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_6046330bc803b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://paguxesij.myartsonline.com/fikepo.pdfIn PDF document text
    • http://jagesaba.epizy.com/bangalore_pin_code_list_area_wise.pdfIn PDF document text
    • https://d6477b75-8e4d-4453-8bbc-a86a6009e57c.filesusr.com/ugd/261d41_d132e62cccdc45c88487bf5cdfc26555.pdf?index=trueIn PDF document text
    • http://lenawukefiraba.rf.gd/pamamizoduz.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_a6290c60d65646e69190480ea54cbf78.pdf?index=trueIn PDF document text
    • http://dawiwafawuz.epizy.com/78225748778.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_525031503a7a413ca2af6453de7a1496.pdf?index=trueIn PDF document text
    • http://fowasabitafal.epizy.com/63782560326.pdfIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_9b8b8c52f0b44d4cbd3a14c1fdff9b32.pdf?index=trueIn PDF document text
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_67c62b52a13945b8a65fe158def05c8a.pdf?index=trueIn PDF document text
    • http://gigitepusiligo.epizy.com/best_book_to_learn_english_speaking.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_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 5360 bytes
SHA-256: b6a082e6d41f4dcd139fd4d70def0e1e9f006e1b281d6e5642a5abe7bac8e822
font_01_sfnt_off0000fb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 10576 bytes
SHA-256: 4c702feb7e92d2fbeacbeaa2dfcbe7eb17dbb6799e0574d37eb33e5a01e808c2