Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d48b1c3610115b…

MALICIOUS

PDF

148.6 KB Created: 2021-03-25 06:10:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: eb5501d0e5130ddd01d31b8260678e21 SHA-1: ea05c184484f12c597da9e2c935857ab319c4a3a SHA-256: e3d48b1c3610115b7062397c91936e57c430c0db304e108204c327f920b9e52d
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 and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://jumiwimov.ru/award?keyword=biosynthesis+of+hormones+pdf PDF link annotation
    • http://rankingcoach-seo.com/44073710524p41ym.pdfIn PDF document text
    • http://ig-mediateam.net/6332539894y720p.pdfIn PDF document text
    • http://grampus-shop.com/97773056773gvap0.pdfIn PDF document text
    • https://vemomomofaj.weebly.com/uploads/1/3/2/7/132740815/nefokepuxifabid.pdfIn PDF document text
    • https://fagugirawax.weebly.com/uploads/1/3/4/3/134388021/b82e8928.pdfIn PDF document text
    • https://jexelokase.weebly.com/uploads/1/3/5/3/135321670/8306995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_5fe783e2d8d35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_6051855522f06.pdfIn PDF document text
    • https://piturerakilapes.weebly.com/uploads/1/3/0/7/130775197/pinanizojiviva.pdfIn PDF document text
    • http://govnosiakxws.online/fuseg1zig5.pdfIn PDF document text
    • http://teksalle.xyz/after_effect_cc_2016_kuyhaa29z7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454977/normal_5fcd0108db6a7.pdfIn PDF document text
    • https://cdn.sqhk.co/wumigapinido/ejhGw7w/tokepisadudifarim.pdfIn PDF document text
    • https://dimulawi.weebly.com/uploads/1/3/4/3/134380670/6859515.pdfIn PDF document text
    • http://draiwenstore.online/tv_ears_5.0_dual_digital_reviewslbfss.pdfIn PDF document text
    • http://pakunobun.getenjoyment.net/concise_oxford_dictionary_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zatufora/gihaAs0/50th_birthday_party_themes_for_husband.pdfIn PDF document text
    • https://cdn.sqhk.co/xerejijasoma/fhagjga/right_frontal_arteriovenous_malformation_icd_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xomutojekes.myartsonline.com/xiberilixitoxe.pdfIn PDF document text
    • http://wokidomogu.onlinewebshop.net/bosageva.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_off00020902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20902 5192 bytes
SHA-256: 1113d8d81c28967a9fb09e618a0df87418ab1af364939e43a5c7ecf21f935e6d
font_01_sfnt_off00021a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A8F 12380 bytes
SHA-256: 14a8e6c55312a1b38946d9b5d47f579ab4ab0aca00854a4d549addd5d13a20ec

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