Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1777d1235e33bc…

MALICIOUS

PDF

82.7 KB Created: 2021-04-17 13:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8d16898501afd0641abd503a5acb06c6 SHA-1: 03a0bff92d2b201f0ae4ed0a1a12757428c39559 SHA-256: 5c1777d1235e33bcebd3d395a7ea56788b21f4bb064833560f1adb7f725682b0
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 is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Aqa chemistry a level revision notes unit 1'. The presence of multiple external URIs indicates an attempt to redirect the user to malicious content, likely for phishing or malware 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://baarspo.ru/strik?utm_term=aqa+chemistry+a+level+revision+notes+unit+1 PDF link annotation
    • http://onenature.space/4140168325r0u29.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/bopim.pdfIn PDF document text
    • https://tataberoxem.weebly.com/uploads/1/3/0/8/130874397/4232288147b.pdfIn PDF document text
    • https://jogelobob.weebly.com/uploads/1/3/5/9/135961552/nujawowalalibadu.pdfIn PDF document text
    • http://dimax.website/50924158697yrtoq.pdfIn PDF document text
    • http://biomanua.website/how_do_you_get_rid_of_a_cystic_pimple_overnightqcc69.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/printable_dot_journal_pageshx8ac.pdfIn PDF document text
    • http://svoytrylend.xyz/my_school_bag_coloring_sheetse0duu.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/fudujidosejuz_selifik_rutizi.pdfIn PDF document text
    • https://xovixonu.weebly.com/uploads/1/3/4/8/134896571/guzinaxexuvesopowewe.pdfIn PDF document text
    • http://getchambre.xyz/cuales_son_los_tipos_de_planes_de_negocios88w12.pdfIn PDF document text
    • http://tapidiv.medianewsonline.com/zamaneliwalevudoweti.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/50426250637b85b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rewuwuja.onlinewebshop.net/revista_eudora_ciclo_6_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9edd43f9-6e49-4983-9721-403306cc875e/how_to_do_magic_tricks_123_go.pdfIn PDF document text
    • http://fiwemigusa.rf.gd/where_to_buy_sunbeam_electric_blanket.pdfIn PDF document text
    • http://bexalawisilinot.epizy.com/zomakevodigamivogujabu.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/ranenawoponomipufuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d489f3d1-3d8b-442d-a38c-c9c1cd6c75ae/35179371538.pdfIn PDF document text
    • http://jupagezasolax.rf.gd/xitibolulagijenakoge.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_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 5368 bytes
SHA-256: d011897fee614fc3c9742b21a88743bf9f24544f2a9e69c2d0a9b748781b0b04
font_01_sfnt_off0001171f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171F 11344 bytes
SHA-256: 88e94bc8d9a829cfae72be649d854e92057e46bc6cb3edb6c686ca55be98c85a

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