Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb639c03188a320…

MALICIOUS

PDF

81.6 KB Created: 2021-04-02 23:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: df670360b6c1620cfa12c8383f8be01b SHA-1: 5fe654a3d66c45b20dabbefa626506d00f66b1fd SHA-256: afb639c03188a32059b46840b7e7f1adf4f5fea4ef8cd2e77f2261c3010a01d8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and configured as link farms, which is a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/123?utm_term=angular+6+date+format+directive PDF link annotation
    • http://nelilovodik.scienceontheweb.net/java_exception_handling_example_programs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457849/normal_6061178d8fe33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480161/normal_5ff7a8dbb7269.pdfIn PDF document text
    • http://logunej.iblogger.org/wheel_of_life_template_blank.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453747/normal_5fcba03fba903.pdfIn PDF document text
    • http://boguzimaro.getenjoyment.net/16243461184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454672/normal_604a5854ed7d2.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/thank_you_for_being_late_review_guardian.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5fe01a8bef15e.pdfIn PDF document text
    • http://optalpha.com/vodotaterodi30g67.pdfIn PDF document text
    • http://nefutekugurenap.mygamesonline.org/causes_of_environment_pollution.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486743/normal_5feff1657c8b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462038/normal_603ead50d850d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_6054bcde13331.pdfIn PDF document text
    • http://legalvictory.group/2001_subaru_outback_max_tire_size904ks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_605676807dc0b.pdfIn PDF document text
    • http://storezone.info/archeology_book1iph6.pdfIn PDF document text
    • http://gedobitubojufu.iblogger.org/peppermint_beadlets_doterra.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tavupovasar.rf.gd/banyan_tree_3d_model_free.pdfIn PDF document text
    • http://letituxis.epizy.com/26924416018.pdfIn PDF document text
    • http://zizolim.rf.gd/nationwide_building_society_covered_bond_investor_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df8e35c2-7b98-4fc1-bd6b-4deedb68a4c8/how_to_unlock_honeywell_t5_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/306c3b02-c2c6-4ebe-8b3d-6c4a856607c6/94507611775.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_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 5368 bytes
SHA-256: 01b50cf9ee5a6c3dbc3c2455db440d5ebbaf91a9d1dc8453945b1af98ba419b9
font_01_sfnt_off00010f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 12432 bytes
SHA-256: f2a3f74cb99de8860c61214b41ba6c15d697f5decb6506f52008d1fa82fdd3e8

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