Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ef7d3b883c2c93…

MALICIOUS

PDF

78.1 KB Created: 2021-04-16 00:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ab5047b0f4fcc0ce2a59ef2074842ee0 SHA-1: ccd962b94146f49915bc91700c4ea9dd75da9ee3 SHA-256: 11ef7d3b883c2c9358d96420029d4cd7b5378a71c5886a9d3cee358f355958c9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://jacksth.ru/strik?utm_term=pak+study+mcqs+pdf PDF link annotation
    • http://vazawujuzu.sportsontheweb.net/patch_notes_sims_4_november_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_602d59d84c2ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491164/normal_6066867289974.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/13547609051.pdfIn PDF document text
    • https://mebavobof.weebly.com/uploads/1/3/4/5/134592521/05919eeedb15.pdfIn PDF document text
    • https://nixixufusolawig.weebly.com/uploads/1/3/4/8/134882604/3594110.pdfIn PDF document text
    • http://wunadimizurened.medianewsonline.com/honda_gcv160_pressure_washer_owners_manual.pdfIn PDF document text
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/4247046.pdfIn PDF document text
    • https://getaforufuzok.weebly.com/uploads/1/3/4/7/134733873/xemevu-wapek-wufonel-bifurapakekopas.pdfIn PDF document text
    • https://xuwojuzo.weebly.com/uploads/1/3/4/4/134471705/11b977e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rijesoso.rf.gd/57891309210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/858efea6-2025-45a4-97f9-c8fee55a87a8/8226619048.pdfIn PDF document text
    • http://gulagopafed.onlinewebshop.net/ikea_catalogue_2020_ksa.pdfIn PDF document text
    • http://dipagepe.atwebpages.com/78893133774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e312369b-0e5d-401f-a423-736581367aa9/how_to_use_ninja_blender_professional.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c55c9149-017d-4cd7-8772-f95e0bb41e86/security_analysis_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f478c331-144c-4546-ba11-c04b51a5affe/29229802320.pdfIn PDF document text
    • http://tosurok.myartsonline.com/red_lobster_nutrition_facts_2021.pdfIn PDF document text
    • http://furunes.onlinewebshop.net/ragilesirulotu.pdfIn PDF document text
    • http://poxatita.epizy.com/rowenta_focus_iron_cleaning_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b6ab86-b491-4da7-88dd-d928c6a7e56f/my_pet_animal_essay_for_class_3.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_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 5468 bytes
SHA-256: 955e2711c429f9104a8b51162f98f8f36d9462bdf9a9d0cdb2f861b44ebb98ca
font_01_sfnt_off00010694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 10896 bytes
SHA-256: 8daae724c12ef3d038c31a0b8047d1ee5cde7a1a72d823d4c70a2017935b7ae2

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