Malicious PDF — malware analysis report

Static analysis result for SHA-256 406556225d61670f…

MALICIOUS

PDF

78.3 KB Created: 2021-03-16 16:53:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 40e116358cfa9efa7f8503eb21d1273c SHA-1: 23cc370b46fb4f628b4f6e543b5f4b8021d12c9a SHA-256: 406556225d61670fb0bca554da6bb78a697b82249ee97e93ce8632abd06e00bf
186 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 of which point to disposable domains and are likely part of a link farm designed to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous suspicious URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://zajinet.ru/strik?utm_term=chapter+2+section+5+ratifying+the+constitution+quiz+answers PDF link annotation
    • http://stroymarketmetal.ru/open_mind_beginner_a1ekiaq.pdfIn PDF document text
    • http://scm03.ru/85895760745hy4pw.pdfIn PDF document text
    • http://mugukix.mygamesonline.org/wodokilan.pdfIn PDF document text
    • http://torchqbfl.fun/kizerk5dmq.pdfIn PDF document text
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/c9a74ddeb.pdfIn PDF document text
    • https://nesamakamaxo.weebly.com/uploads/1/3/1/6/131636712/d944f4.pdfIn PDF document text
    • https://zejibafubetu.weebly.com/uploads/1/3/4/1/134108860/9967680.pdfIn PDF document text
    • http://shopyou.online/76943807569n1z8c.pdfIn PDF document text
    • https://bapuporodotuxo.weebly.com/uploads/1/3/1/3/131381531/xalijapokez.pdfIn PDF document text
    • http://begimewabifax.getenjoyment.net/84706183378.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/15265327371.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/d7dc7724-a90b-4377-878b-deddda37f9e2/the_gospel_of_wealth_by_andrew_carnegie.pdfIn PDF document text
    • http://wovibojo.onlinewebshop.net/formato_minuta_de_trabajo_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca93de82-2c8b-4075-b952-08181736940c/how_to_read_wind_load_charts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa013d14-8549-4012-acfe-7435eb67334f/disney_cast_member_tickets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83286b1f-a206-4469-bd57-947a9deacd08/bose_321_series_ii_remote_control.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/lonely_together_english_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec151d4-266b-4b30-a756-5ecabc9ee920/59815341153.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/tofevozutoduva.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/software_development_manager_salary_philadelphia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c3d09d1-274d-40c5-9d5e-5e752d9dc3fa/78615598340.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/81166401864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae0910b8-8c0a-43f7-b2c4-f650d9afe81c/tujigakobakuvimoxedames.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae9a656-cdfc-469e-a588-ccca9d4168fd/fundamentals_of_digital_logic_with_verilog_design_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4cdc394-8661-477b-ae3d-f2cfdae5c6fb/92628834871.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_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 5776 bytes
SHA-256: 429ed0f2653abe62ebf842d67e7c4a915528822f82d55b06541a85b93389d4d5
font_01_sfnt_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 10368 bytes
SHA-256: f40d27644580162fcba55714534bf28f3f06463f56e39f2f0b3734e056535842