Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7d4b860a8c1fba…

MALICIOUS

PDF

82.7 KB Created: 2021-05-29 03:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: abd99bd1c7b3a57dfb57ebecac2a9c7c SHA-1: 53bf9feb48c48052f9c4fd4275edc3718800da96 SHA-256: 4d7d4b860a8c1fba58665985d9384ae84ec09e66238a44aec09f1423d2caac58
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a phishing or SEO manipulation attack pattern, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=how+to+join+the+bedwars+server PDF link annotation
    • https://wikexamug.weebly.com/uploads/1/3/5/3/135343860/tawurugejojigirew.pdfIn PDF document text
    • https://loneluripovulom.weebly.com/uploads/1/3/4/3/134364014/39225dd46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500679/normal_6038470c8f857.pdfIn PDF document text
    • https://datagoso.weebly.com/uploads/1/3/4/7/134718767/gezowevowawilufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392869/normal_60625af4b2308.pdfIn PDF document text
    • https://tapuwapefozex.weebly.com/uploads/1/3/4/3/134350869/gurexixu_lalibego_dezuma.pdfIn PDF document text
    • https://peworiwuka.weebly.com/uploads/1/3/4/6/134693567/selige-sidusejudusijox-kulutu-niwesebagad.pdfIn PDF document text
    • https://nazesamujev.weebly.com/uploads/1/3/1/3/131397942/jolerepap-sonopufogokoj-pilabavi-ferunot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486365/normal_5fc90bbfa69cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_605bc4ea92d75.pdfIn PDF document text
    • https://xasugalepo.weebly.com/uploads/1/3/4/3/134311154/bec8675.pdfIn PDF document text
    • https://jipibivit.weebly.com/uploads/1/3/4/0/134012636/legoraguvuvejexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445877/normal_604af7227ddb4.pdfIn PDF document text
    • https://gajaxaja.weebly.com/uploads/1/3/2/7/132712369/gimexidiretolo.pdfIn PDF document text
    • https://vosuxawa.weebly.com/uploads/1/3/1/1/131164537/vozilezogunen-noweboxepep-gozanagatofojus.pdfIn PDF document text
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/49a5923f504cc.pdfIn PDF document text
    • https://nidimikijugura.weebly.com/uploads/1/3/4/7/134710695/711bbf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420031/normal_5fefb79e41597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_602f33232044a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403960/normal_5ff9e2457d92e.pdfIn PDF document text
    • https://jafoxexaromomev.weebly.com/uploads/1/3/5/2/135296472/6286932.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
    • 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_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 4996 bytes
SHA-256: 1a72288c22ca8e14432ff830707d0f35e01da5900f9fbf8f82080105a0bb5e72
font_01_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 14700 bytes
SHA-256: 1d454daca94be1cf5dbe223a8860117b9c895886060d68bef05aaeb0a6a8751a
font_02_sfnt_off00012dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361