Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec0a57e4cb76188…

MALICIOUS

PDF

77.5 KB Created: 2021-03-23 16:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a7a42690a6cc4616660ce9e7e38521b1 SHA-1: 5803b2d60c5f3992a145e2b51f154ff4cb3c5450 SHA-256: 5ec0a57e4cb76188f6d2d176f36ae0a5dec79d6cf6a31075d000fde32e4e594c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/123?utm_term=harris+beckenham+school+uniform PDF link annotation
    • http://begdas.space/68990425018yjkf1.pdfIn PDF document text
    • http://boputev.66ghz.com/vitamin_sources_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_6040e017e01e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_604041944e331.pdfIn PDF document text
    • https://kuxadituva.weebly.com/uploads/1/3/1/3/131380841/lopapovevifuw-jeret-gemoxixur.pdfIn PDF document text
    • http://makamar.tech/sample_business_plan_coffee_shop_ppt8cwpp.pdfIn PDF document text
    • http://generalmassage.online/diablo_2_cd_key_generatork53yp.pdfIn PDF document text
    • http://difuwikikum.iblogger.org/free_template_brochure_ai.pdfIn PDF document text
    • https://kikosezuzo.weebly.com/uploads/1/3/1/3/131378972/77d997.pdfIn PDF document text
    • http://levantegroup.net/does_hopper_3_have_sling7t2xv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://putojeferef.rf.gd/bug_report_template_html.pdfIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_25c866c5d9d744959f4f379a213f7895.pdf?index=trueIn PDF document text
    • https://cb71deac-5427-4a11-aec2-6feec017c243.filesusr.com/ugd/4cd983_6334113b92ca4fbfa49eaef90e463e49.pdf?index=trueIn PDF document text
    • https://ee809a51-a58d-41df-a269-13688c4e1c69.filesusr.com/ugd/5f587b_6ee592eb836e40ff8af9c7e188804fd2.pdf?index=trueIn PDF document text
    • http://lolukojalima.epizy.com/84590292798.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_3466164beefc4e4b8ffd81bb32f796ac.pdf?index=trueIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_2f821217d1824969a947e3dad401a3c2.pdf?index=trueIn 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_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 5288 bytes
SHA-256: 34ddfce74d99d5c2d9ef382c45f959e8d0e3123f3b6623c4a4c595168e211b38
font_01_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 12120 bytes
SHA-256: 2c1ba2579c2706fa2f1220591539dfb36fa25b16ef8b311a3347312121d32972

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