Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b47db425fca2e70…

MALICIOUS

PDF

70.6 KB Created: 2021-04-29 17:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 75c7197eb9f797bd408e9df141c014b8 SHA-1: 0500ec5cdc7818c0d9de3ae0a1b7241ddadb8779 SHA-256: 1b47db425fca2e7024998b222fc90755b8aaddd1be7240be99ec79af38fff212
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, suggests a lure related to thermostat setup, directing users to external sites. The presence of numerous links, many on disposable hosting, points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=how+to+set+up+proselect+thermostat PDF link annotation
    • http://neuroncraft.online/difutetagilixijohgj6m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500904/normal_602d4832d0fb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495262/normal_606cc86ac14da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380522/normal_5fc9fab4b2032.pdfIn PDF document text
    • http://getallcreditscores.info/living_with_the_himalayan_masterszfsz0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425484/normal_5ff4852ba8720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_604461166a44a.pdfIn PDF document text
    • http://fb-copyright-help-from.com/chuunibyou_demo_koi_ga_shitai_saison_1_episode_7_vostfrudvv7.pdfIn PDF document text
    • http://swiss-family.space/729355564281md2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453900/normal_6052bbfc9a2e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424026/normal_60530d720298b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_605f53f5bfbf0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lowadof.epizy.com/deloitte_thailand_transparency_report.pdfIn PDF document text
    • http://rivenoke.onlinewebshop.net/formato_de_nmina_en_excel_para_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/lippincott_biochemistry_7th_edition_online.pdfIn PDF document text
    • http://nakarajibap.myartsonline.com/93197234424.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/pelisoka.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/ms_word_for_mac_2011_updates.pdfIn PDF document text
    • http://kopolug.myartsonline.com/borg_warner_velvet_drive_identification.pdfIn PDF document text
    • http://tisikifapov.rf.gd/comfort_zone_infrared_heater_user_manual.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_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 5224 bytes
SHA-256: d3da76d7434fd7eab19ac4d7dfdc166f4ac311795ebeac22411cae4d37d08576
font_01_sfnt_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 10492 bytes
SHA-256: a8c5cfabe246328bd73c6ed8a4d9fd83440408f2cef70357b286751def6a94e6

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