Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b73af5f375bf0ad…

MALICIOUS

PDF

76.9 KB Created: 2021-03-02 17:35:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8d4c389bce66527e6ecbd31e67c9a05d SHA-1: 91a90f59edd3736451e044878eb42a6db1d71399 SHA-256: 1b73af5f375bf0adf9ac7679f4c3a836492de6fd311bd52a3137e001e9378341
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or redirectors, indicating a phishing or link-farming attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a T1566.001 (Spearphishing Attachment) attack pattern, aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=dolores+cannon+books+for+sale PDF link annotation
    • http://remontnatali.ru/acrylic_nail_set_for_beginners_uk2rixf.pdfIn PDF document text
    • http://dizewut.22web.org/how_to_reset_a_samsung_phone_to_factory.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/Hjjiadh/history_of_science_in_medieval_times.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450148/normal_601a9e396a2c3.pdfIn PDF document text
    • http://satupij.22web.org/74350662416.pdfIn PDF document text
    • http://takipleskazan.org/32979261197uctru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_60378c5560162.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/57099575628.pdfIn PDF document text
    • http://nakozek.mypressonline.com/63115704005.pdfIn PDF document text
    • http://fiselijuduguge.iblogger.org/carbothane_134_hs_product_data_sheet.pdfIn PDF document text
    • http://chategratis.online/my_friend_cayla_doll_app_iphone7enky.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zenejifawulo.epizy.com/ford_mustang_for_sale_houston.pdfIn PDF document text
    • http://kudurefusi.epizy.com/sql_server_2008_developer_edition_free.pdfIn PDF document text
    • http://biboxafidalus.epizy.com/hilton_university_onq_training.pdfIn PDF document text
    • http://tukaxowelu.rf.gd/binomische_formel_rckwrts_lsen.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_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 5080 bytes
SHA-256: 734b5035fdd9d38afa99b27a91d4fa2147e31972b6c49eb6de78b35bc67fcd4f
font_01_sfnt_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 10908 bytes
SHA-256: 8296d900a5b2fbd9ac0ae1528663a217031605d21cc9b3fc20139290186b648f

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