Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f952a88fc8e9aa…

MALICIOUS

PDF

77.7 KB Created: 2021-03-25 18:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f5718d286ce8833f1fcee99f08fba66c SHA-1: 06b5f34a3778e3cc53fbb4d6e9dd6667d47f942d SHA-256: b1f952a88fc8e9aabcea09a933b8fed15c08fdfb6af3766dfc469c7405dd966d
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites.

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://mezovuduw.ru/123?utm_term=libertango+sheet+music+accordion PDF link annotation
    • http://xajoxirutojik.iblogger.org/adobe_photoshop_elements_14_free.pdfIn PDF document text
    • http://fruitslope.online/hang_glider_buying_guideydoax.pdfIn PDF document text
    • http://tesubozapo.22web.org/19882979230.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/zusesozamugu-nuzixuwet-safox-zexegeje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376101/normal_6007bf4012b0b.pdfIn PDF document text
    • http://kvrovk.xyz/crafting_and_executing_strategy_21sth37dh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494648/normal_6057181c15dd2.pdfIn PDF document text
    • https://revunipaletofux.weebly.com/uploads/1/3/0/8/130874393/6260218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468289/normal_60518754e5139.pdfIn PDF document text
    • http://blue-tick-central.com/singer_model_9410_sewing_machine_manual3id7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407062/normal_601724b47f4db.pdfIn PDF document text
    • http://ylyn.ru/580460101359tkpi.pdfIn PDF document text
    • http://naturebiolog.space/whats_funny_on_netflix_ukp0146.pdfIn PDF document text
    • https://sivevaredewiw.weebly.com/uploads/1/3/4/4/134464028/lojejuxezupejutawij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466379/normal_6029a719eb677.pdfIn PDF document text
    • https://puxodemidumez.weebly.com/uploads/1/3/5/3/135345879/3873620.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://merozutoxagofil.epizy.com/what_is_therapeutic_communication_in_psychiatric_nursing.pdfIn PDF document text
    • http://wotalajo.epizy.com/xodetevivadobotugir.pdfIn PDF document text
    • http://nefijojutofad.rf.gd/capitulo_1a_actividad_8_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d260d4c0-1e81-4ff7-9f15-5fb6574ad60a/100_aos_de_soledad_in_english.pdfIn PDF document text
    • http://ledojiwibobuva.rf.gd/bmw_x2_manual.pdfIn PDF document text
    • http://vupikefugogulup.epizy.com/9329634339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ca0847-d8ad-4a4a-a1ff-ed5fe644b1d6/jevowovifokexoradatine.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_off0000ef34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 5400 bytes
SHA-256: ab245a273c463100c1ad43826e685d791d60bf62c18ab6f3f17a25c7972c7691
font_01_sfnt_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 12176 bytes
SHA-256: a73739a40feaf697f77795127c607c01c852d57d17bc65f46eefa2a7fcb3eccf

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