Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71e8de748f4c07e…

MALICIOUS

PDF

76.2 KB Created: 2021-05-14 09:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5ba8c161c8eb0ff46f9b1ad71a6ff3e2 SHA-1: 7b5eb91ec86f0a3f1b15a7d835e79557da92fba5 SHA-256: b71e8de748f4c07e0554821380f5d194a9eec468c5a4f507aef990822ec7dd5c
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lure users to malicious sites, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=1+ejemplo+de+dialogo+directo In PDF document text
    • https://static.s123-cdn-static.com/uploads/4480886/normal_5fde449540706.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392237/normal_60024f20922c9.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/bXMhi34/new_notification_ringtones.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_6030694510b77.pdfIn PDF document text
    • https://cdn.sqhk.co/luzorisu/hejf5jc/web_design_flyer_template_vector.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_60568dda8816d.pdfIn PDF document text
    • https://cdn.sqhk.co/gunakawujo/hAhaw21/jexulumifiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493891/normal_5ff52d6bbc2f9.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/pafesinawipasegekexezew.pdfIn PDF document text
    • https://cdn.sqhk.co/lizuloka/idihMja/33039249442.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/2017_lexus_gx_460_for_sale_near_me.pdfIn PDF document text
    • http://benivosefemiza.medianewsonline.com/publication_550_irs.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/wanifalomazerojovebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5fd267be9f363.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/gjgdiah/amazon_seller_central_customer_support_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/buzunonoj/XjeUru3/512161850.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/wenobagupexekap/1315732517.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/vidmate_er_hd_apk.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_off0000eacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 5248 bytes
SHA-256: c961b9090e4eda6cb1efc2840f3cd2ff357c92ec929e950a733e0f091aebd39d
font_01_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 11700 bytes
SHA-256: 2641f5d4d8f9b9548231abc3ee1436756d50337f0fa8d974fc28c3f97b36165b

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