Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a66abe3e9e2c772…

MALICIOUS

PDF

72.6 KB Created: 2021-03-24 22:59:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0ba76abb98f4ebc62d78c9180a50db5f SHA-1: 41cf45b43fc62432d06324a45ed544f8f5bbb142 SHA-256: 4a66abe3e9e2c7726310126d9f2b47bb4f0de258948b04b47438244732837d06
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to 'golowaki.ru', which is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/strik?utm_term=film+review+template+word PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415065/normal_6028ba672f56a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492272/normal_5fd0630370945.pdfIn PDF document text
    • http://copyrightviolationcenters.com/video_making_software_free_for_pc6qc9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450434/normal_603f1d8a4385b.pdfIn PDF document text
    • http://javaxirivibewi.mygamesonline.org/59391409688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423696/normal_604871f5765d1.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/bivisirijuxojaxori.pdfIn PDF document text
    • http://gokawojop.scienceontheweb.net/tekudat.pdfIn PDF document text
    • http://veviwumifuvemuz.mypressonline.com/pijixufule.pdfIn PDF document text
    • http://dafesoxexigu.medianewsonline.com/bookshelves_plans.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390661/normal_5fe4c8f72bb7f.pdfIn PDF document text
    • http://astrology-personal.online/xadikevilimadekigemoz3col.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/xoboxofikafizafnfn8u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407571/normal_600db5bf48987.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/busutafitufe/xilujofopefesunavo.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/74078927634.pdfIn PDF document text
    • http://fabevax.myartsonline.com/where_to_find_graco_car_seat_expiration_date.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/39786270980.pdfIn PDF document text
    • http://zeteximezoxa.myartsonline.com/37725554115.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/sebaneferijo.pdfIn PDF document text
    • http://jikelaxapexa.onlinewebshop.net/kuxiwi.pdfIn PDF document text
    • http://sefokirof.onlinewebshop.net/xaxugajunub.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/user_acceptance_testing_sign_off_form.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_off0000e1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 5036 bytes
SHA-256: 81a8e59460a102b88e7a0cf7a7e90e2ab436a38121d16d367cff8ba607746364
font_01_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 10024 bytes
SHA-256: 98b15ca3372888d38cad4c4de9bd12f2bc8030ad30d3e6a969820c81d88c1de1

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