Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96533e84c9364a1…

MALICIOUS

PDF

74.7 KB Created: 2021-03-19 09:07:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 76e82f3ec9a3979454ff1ea7cf074fb7 SHA-1: 7766d9211c47186506ed00ac6992ee5afb16dab4 SHA-256: a96533e84c9364a140c73a3d2bc4e78d265d75f15ff7594b312eb67307ce49fd
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, specifically as a phishing trojan. It contains numerous external URIs, with a prominent one pointing to 'nipisod.ru', suggesting a redirection to a malicious site. The document body, though partially garbled, contains text related to smoking cessation reviews, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=the+easy+way+to+stop+smoking+reviews PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377403/normal_5fe3e34772e3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413240/normal_602f9efcadaa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_6029a7c93e158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476273/normal_5fd355ab22f8c.pdfIn PDF document text
    • https://zinaxavum.weebly.com/uploads/1/3/4/3/134354277/kedagafajado_poxolum_xivojuvorinawo_duwexudisopusu.pdfIn PDF document text
    • https://bapumuper.weebly.com/uploads/1/3/1/1/131164114/nazatugiwo_jerezasegawo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463306/normal_60522fb39cee7.pdfIn PDF document text
    • http://jujiwaneko.iblogger.org/belajar_coding_android_untuk_pemula.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_c2f4e0e214d44c2dbad2791e9696d57f.pdf?index=trueIn PDF document text
    • http://wivovazu.epizy.com/babuji_dheere_chalna_full_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf4da02-ca30-41e4-bf66-0e4bc8910cd0/healthy_breakfast_smoothie_recipes_for_diabetics.pdfIn PDF document text
    • http://xuratuf.epizy.com/what_is_newtons_laws_of_physics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c03fba8-8ff1-420f-87a3-097b550a800e/76610937681.pdfIn PDF document text
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_6e08b528fd7b4d1eb40a8990394644d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dixaleko/miller_millermatic_130_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/bhaagamathie_tamil_movie_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83c282c-0f6d-4c67-a9d4-1a12573c5005/42965076477.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/chiari_3_malformation_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8844aa3e-1442-43ba-bb32-dada302c202b/gafilebi.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/94522320513.pdfIn PDF document text
    • http://dojajenubiti.epizy.com/advanced_accounting_guerrero_2020_solution_manual.pdfIn PDF document text
    • http://jopinewo.epizy.com/how_fast_do_you_go_into_deep_sleep.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/76179101451.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_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 5468 bytes
SHA-256: 50532a1cccb8b82d556c02242fd9b8a0a5abeadc6ddffc5b0b279f196d4c344d
font_01_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 11208 bytes
SHA-256: 98714865beb5bb7b4c91520ca2e310dc8e78304613b30c3280dfbbf51090f78d

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