Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c2b54f941b4559…

MALICIOUS

PDF

77.4 KB Created: 2021-05-09 06:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bde0417cc964e878b65b272534937a12 SHA-1: 599b5af13485b7525e5d74c16d7212c7c63d9e0f SHA-256: 22c2b54f941b4559713e8bba11ebba0a1dfe105db8e763d1794ed6b8535764cb
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, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=how+to+switch+scientific+calculator+to+radians PDF link annotation
    • https://cdn.sqhk.co/gabebutiz/hfiaUjh/61053648751.pdfIn PDF document text
    • http://titujewegefo.iblogger.org/applied_multivariate_research_meyers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492250/normal_600a0847b4abc.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/Gggjcih/75728539136.pdfIn PDF document text
    • https://cdn.sqhk.co/fapiwejagiz/aKeLb1i/run_rabbit_run_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/sidigodoga/IUrhi8C/noronepavositetakawo.pdfIn PDF document text
    • https://cdn.sqhk.co/rotelizedo/gjKgiUC/lutisozilazimomamogisexo.pdfIn PDF document text
    • https://cdn.sqhk.co/nivatasob/geqhhN2/20742197438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495240/normal_6068264087647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_60304d8e0d643.pdfIn PDF document text
    • https://leduzurukidep.weebly.com/uploads/1/3/4/8/134858842/degigume-nemugevopezanub-durivugipugowa.pdfIn PDF document text
    • https://cdn.sqhk.co/feduvefas/1LfNPVj/94323455259.pdfIn PDF document text
    • http://dulugidi.iblogger.org/vetavifuxonirazuronenar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475989/normal_60298d8e5d1ce.pdfIn PDF document text
    • https://japatuxivavagax.weebly.com/uploads/1/3/0/7/130775167/2f119e.pdfIn PDF document text
    • https://cdn.sqhk.co/piwuzuberaze/gSXjchj/mimpi_dreams_switch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465025/normal_5fd66a041f3a6.pdfIn PDF document text
    • https://cdn.sqhk.co/fuguwaso/U2gdngg/kumupasedotutamixatefapo.pdfIn PDF document text
    • https://sozulidalipidin.weebly.com/uploads/1/3/1/4/131437061/474693.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kotodur/how_much_should_i_pay_for_logo_design.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/free_complaint_form_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/jugosuxapexizufinasin.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_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 5160 bytes
SHA-256: 868bf2c2a3d319fa62b27f182f74c16a8ff8b9912aecbe31803621d61f9e9c1c
font_01_sfnt_off00010425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 10492 bytes
SHA-256: bfcbe90785d558e05e55b33c3531eb085a24335464772f7f0b09c58dc2faf047