Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d35386f8a8111c2…

MALICIOUS

PDF

85.4 KB Created: 2021-04-07 14:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 269ad81d62034e7eb1ea390a4a9f8b84 SHA-1: 9e22546cb3706f76aa12e48761cbbfdb1cae8a93 SHA-256: 5d35386f8a8111c22d3095528d65590030b89d12b309f74c8dc1ee883857fadf
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://ponafet.ru/aws?utm_term=elenco+de+los+juegos+del+hambre+sinsajo+parte+1 PDF link annotation
    • https://pofitefe.weebly.com/uploads/1/3/4/6/134617546/44b71c5.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/Vgjgeig/zewadafitapulezatuz.pdfIn PDF document text
    • https://nugubigu.weebly.com/uploads/1/3/5/3/135323865/3537996.pdfIn PDF document text
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/4651812.pdfIn PDF document text
    • https://cdn.sqhk.co/felinavaw/ibmijEl/bilipijuwoduwusuzemadusu.pdfIn PDF document text
    • https://nironaguvotu.weebly.com/uploads/1/3/4/5/134530025/bawubakujupevaf.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/jgMjcnk/flyers_poster_maker_graphic_design_banner_maker.pdfIn PDF document text
    • https://xumebarukez.weebly.com/uploads/1/3/4/6/134687090/8951541.pdfIn PDF document text
    • http://fufumizajo.22web.org/39022568023.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/bZgijVa/train_driving_simulator_free_online.pdfIn PDF document text
    • https://bofopigefofimun.weebly.com/uploads/1/3/4/0/134016695/7653213.pdfIn PDF document text
    • https://cdn.sqhk.co/wozobifanu/5jefdGU/international_travel_checklist_template.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/zomuzigo/children_s_chef_hat_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/35317235964.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_72d767c610f24dc4999015f92021b760.pdf?index=trueIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_bbd759d7ab09469baf1b734539467ab9.pdf?index=trueIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_15e8820beb1e49dcbaef2a83b6ca8d24.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/putelekireza/lee_reloading_manual_1st_edition.pdfIn PDF document text
    • http://nabumib.rf.gd/62587190235.pdfIn PDF document text
    • http://zepurudevivo.rf.gd/classify_quadrilaterals_lesson_32_answer_key.pdfIn PDF document text
    • http://wewurerebapiw.rf.gd/oscilloscope_experiment.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_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 5712 bytes
SHA-256: 6071eb27ab36ff2669e1c6031938558627e521cf6d8655f9a647ceccfda8d06e
font_01_sfnt_off00011d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D49 12532 bytes
SHA-256: f241000b15bb24a975dd7d54c1a70590b17ba3222fb616e3c4540b987359b72a

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