Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b42809a45b1281…

MALICIOUS

PDF

76.3 KB Created: 2021-04-04 19:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fc53094a9772ade2057d51d775b0c527 SHA-1: de83e8381b22d3f8bb871004128034fe5c2a7c55 SHA-256: 50b42809a45b12818c0b4777f2794c973ebbaa9cdaee5057e54abe2ddde0f072
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term' in one of the URLs further supports a phishing or tracking objective. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://fokemale.ru/aws?utm_term=im+essentials+textbook+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375350/normal_5fffb3500ff92.pdfIn PDF document text
    • http://wikowezenitezo.medianewsonline.com/pixuvupibulavigumapuwo.pdfIn PDF document text
    • http://design-kvartira.info/tujixevitepajwe68a.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/psychoanalytic_theory_in_childrens_literature.pdfIn PDF document text
    • http://gejedesoni.getenjoyment.net/historia_de_la_bandera_de_mexico_para_nios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416671/normal_60660425167f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449406/normal_6046c06f0f8bc.pdfIn PDF document text
    • http://samelike.site/is_data_science_easier_than_computer_sciencefpbvu.pdfIn PDF document text
    • http://neuroncraft.online/wine_enthusiast_18_bottle_dual_zone_wine_cooler4gci2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413375/normal_6029d0be4449c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530846/normal_5ff25bf431a6b.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/zevugegu.pdfIn PDF document text
    • http://kigaruzolalo.mypressonline.com/vivopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368467/normal_60571a91d07e4.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/2nd_grade_math_assessment.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/29985646604.pdfIn PDF document text
    • http://magnitoli-2ekran.site/onan_4000_microquiet_generator_fault_codesqds3q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_5fd39a6ac8295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483587/normal_5fd8b8de33ee1.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/shallow_piano_sheet_music_easy.pdfIn PDF document text
    • http://nazhivy.net/zitadapixivomibojifetazo24mdh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447466/normal_5fdf9208185f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gifidabula.atwebpages.com/national_immunisation_program_schedule_2020.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/crayon_template.pdfIn PDF document text
    • http://vigavanoxe.onlinewebshop.net/introductory_econometrics_a_modern_approach_6th_edition_ebook.pdfIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/addition_and_subtraction_to_20_worksheets.pdfIn PDF document text
    • http://zodiripek.myartsonline.com/65066449677.pdfIn PDF document text
    • http://jorasixu.myartsonline.com/itinerary_definition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 5088 bytes
SHA-256: e610cbd9a3cc75e21337778148811abe34aebd445599e7ac8560c4988c31e3c2
font_01_sfnt_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 11104 bytes
SHA-256: 53bd57b9bfa50bbcd739659212f06d97ba4cbd6eb4737a70ad4314d64231be01
font_02_sfnt_off000114ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c