Malicious PDF — malware analysis report

Static analysis result for SHA-256 addc4c8e02bbc14d…

MALICIOUS

PDF

83.2 KB Created: 2021-03-16 11:17:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0e1b41063af26a8dbc0f7d8486cf37bd SHA-1: 8ede6b103626d88757ace05a4a2ba5768ba050d3 SHA-256: addc4c8e02bbc14d596603bd5129141f142d7669698735ae279210b6aa2d5e74
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=filmora+video+editor+for+pc+free PDF link annotation
    • https://gitakitopawal.weebly.com/uploads/1/3/5/3/135325500/8133903.pdfIn PDF document text
    • https://lirefabagobaxi.weebly.com/uploads/1/3/4/0/134012393/8844705ed.pdfIn PDF document text
    • http://deliwubavamir.mypressonline.com/how_to_study_for_hesi_exit_exam_2019.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/50436765628.pdfIn PDF document text
    • https://jufomefafuxujo.weebly.com/uploads/1/3/4/8/134890319/3180782.pdfIn PDF document text
    • https://xumotisububilup.weebly.com/uploads/1/3/4/5/134591263/5035bf0b02042ab.pdfIn PDF document text
    • https://lixebofupasiwik.weebly.com/uploads/1/3/2/3/132303312/1368590.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/54381701531xeapk.pdfIn PDF document text
    • http://erogan-encolumbia.site/dovumulur8a937.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e7179dc9-8f5c-4c34-b165-ab1a8a5c9032/zarefazijomurexuket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18a01f8-182c-4d60-9f8a-07b87da03a16/xorevugulozaravesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b39179f-b6dd-4511-a5c4-361b578243a6/moto_g6_plus_release_date_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1302e1c-8400-48ee-b0d1-ed1bc35bbf99/how_to_write_a_novel_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29af58a7-dd50-4bd4-85e4-066786582be0/questions_about_political_philosophy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e651e63c-55ed-43f7-9623-793b7c291e93/javezubibirurupuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae6e3016-c16f-490e-b3ce-932446f2115c/icewind_dale_enhanced_edition_multiplayer_issues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0c826d-b8f7-431c-a5f2-a8215e7b7350/31939878887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/541a42fe-9286-48e0-b2f0-5d45fe4e7449/what_is_capital_budgeting_in_project_management.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 4820 bytes
SHA-256: 5ac085ccdd474c9957d7bdfb8a64477baee9a990db5886bb621ce50cf072d42d
font_01_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 11984 bytes
SHA-256: 81daf0dc46f19ba359d000c09d368fdbc9dd3026a53d8b41f8b2079f08ce1576
font_02_sfnt_off00012fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c