Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc73cc9fe49d3980…

MALICIOUS

PDF

73.2 KB Created: 2021-03-28 11:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 35631e0b9ccfd162cdb131baa7436033 SHA-1: 53064ca1b01d23f659740957e1f0efa9e086a874 SHA-256: dc73cc9fe49d39801058465eab6a139d8ee1ece25d57be8ce199539ea44d12c7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://mezovuduw.ru/wix?keyword=epic+gifts+for+him PDF link annotation
    • https://vagofavom.weebly.com/uploads/1/3/4/4/134486407/lusoteto-gogirirexavo.pdfIn PDF document text
    • https://pogupevupawigo.weebly.com/uploads/1/3/5/2/135293313/vasafosirenam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487625/normal_603a59824d579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_6037536926d19.pdfIn PDF document text
    • https://jebovemedafo.weebly.com/uploads/1/3/0/8/130813903/7069053.pdfIn PDF document text
    • https://fulariduzumi.weebly.com/uploads/1/3/0/7/130775737/10b380261c7.pdfIn PDF document text
    • https://cdn.sqhk.co/lidumezuvir/gchdzhe/calculus_1_answers.pdfIn PDF document text
    • http://pmaider.com/14472550175i9ngr.pdfIn PDF document text
    • http://electriccannoz.club/xutupeokvv4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481061/normal_5ffa075da7473.pdfIn PDF document text
    • https://tefojemitadu.weebly.com/uploads/1/3/1/6/131606809/takimukobu_zejijofuku_pokawemu.pdfIn PDF document text
    • http://cashbackk.site/jetufixoxo77qig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420245/normal_6037cb1e88986.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwesedujila/xlij03R/3d_anaglyph_movie_maker_software_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/jghjhoE/35906809046.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/voxipanovigepiv/50622304697.pdfIn PDF document text
    • https://4a1fbaa0-0e67-401b-a466-96699e2e5642.filesusr.com/ugd/9647bf_9829c915ef6d40228d19c105370cba01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/consignment_invoice_template_excel.pdfIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_20a99f2ef1ee4285bf720e298c6ac8a6.pdf?index=trueIn PDF document text
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_acd07e6d1fbb40fa9f5da191785a3263.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/6860548187.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_off0000df9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9B 5144 bytes
SHA-256: 8c8b09712746b103acbd80b732e68e08024ee2218445840f8cb4a53b69eb6599
font_01_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 11448 bytes
SHA-256: 2b9b99906cad515c4c65e9a39e229266cf7aa1bc9fc3cf5301aa056b123eafc3