Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8acc5aaa42ef86e…

MALICIOUS

PDF

125.4 KB Created: 2021-03-20 22:58:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: de660425bb5215b22922115938f34b36 SHA-1: c549e48bc2d30b401aef4450685df4e1de3bac0f SHA-256: a8acc5aaa42ef86edd88b05174dc3926f2da7445fe431edc3771d12ef6f9cf1f
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 identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://druttle.ru/award?keyword=linear+harmonic+oscillator+in+quantum+mechanics+pdf PDF link annotation
    • http://gizovivomiz.getenjoyment.net/rexarirupajesekotefapil.pdfIn PDF document text
    • https://zozolunefa.weebly.com/uploads/1/3/5/3/135325744/bajurupomuz_rojalow.pdfIn PDF document text
    • http://zonokiwuwagupu.getenjoyment.net/triangle_inequality_theorem_practice_worksheet.pdfIn PDF document text
    • http://dizofuses.mypressonline.com/classifying_animals_worksheet.pdfIn PDF document text
    • https://bewogataxatux.weebly.com/uploads/1/3/2/6/132695278/fe06df672e.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/nidafamotoxewunanipuwi.pdfIn PDF document text
    • http://newyearshop.site/mikumupl4b8u.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/texture_of_igneous_rocks_in_thin_section.pdfIn PDF document text
    • https://lolovegadagofi.weebly.com/uploads/1/3/1/6/131636941/3b6d90f298.pdfIn PDF document text
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/wodikolofa-fogavisus-bupavu.pdfIn PDF document text
    • http://testertumentum.space/nifetitejasevijabenrmgp.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/26604383866.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/is_there_a_new_jack_reacher_movie.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/how_to_reset_a_bravos_xl_washer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b970785b-8a13-44a7-8f5f-c10e90a96931/what_is_difference_between_evolution_and_revolution.pdfIn PDF document text
    • http://medexode.atwebpages.com/2016_amc_12b_answers.pdfIn PDF document text
    • http://leparitupoxow.onlinewebshop.net/gizatilulozogejaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd4046fd-c442-4370-aa94-1b659e427b19/19895905187.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/bawuvumawaxiwadatale.pdfIn PDF document text
    • http://rufapapufogap.onlinewebshop.net/40783640225.pdfIn PDF document text
    • http://sifebitufol.onlinewebshop.net/15534660818.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B81 5460 bytes
SHA-256: 392191f1c39facd2753234afac11b4b1d48ace4f3a1ecb5b55709f5b15b01aef
font_01_sfnt_off00019de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DE9 14536 bytes
SHA-256: 65e8dee5f61f6d64e71c296448cec9f22374a02a100a444085a6fb38d27dd428
font_02_sfnt_off0001cfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFA3 16820 bytes
SHA-256: f6a2934a15c1de129465ca55019c32d13e282b76a52a8bb53ecf6b67dd62266e

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