Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1df470edf7df9d…

MALICIOUS

PDF

75.1 KB Created: 2021-05-01 13:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0c6ceb51dd69b94a3cb8288b55d2984 SHA-1: 4824fda8305119c952c9e82aff20446e692a5e7c SHA-256: 1d1df470edf7df9d8fcf58090307d7dc11306ce8945b7bdc8d0caee88a0fa12e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to a product search, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=texas+instruments+ti-30x+iis+target
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/petujepiger.pdf
    • http://potajin.iblogger.org/age_calculation_tricks.pdf
    • https://jaduxokapatusiw.weebly.com/uploads/1/3/5/3/135301375/abe30.pdf
    • http://patolul.iblogger.org/dance_music_90s_hits_youtube.pdf
    • https://lesesagipamagaz.weebly.com/uploads/1/3/0/7/130739561/laxafomepov.pdf
    • https://jubagidegugidok.weebly.com/uploads/1/3/5/3/135317658/704201.pdf
    • http://xeberok.getenjoyment.net/biochemical_test_for_staphylococcus_aureus.pdf
    • http://luwimifamofuper.iblogger.org/fagukanotejiwotoxox.pdf
    • http://dazinifuxevoji.22web.org/10102896222.pdf
    • http://fukerijinexin.mygamesonline.org/html_css_for_dummies_free.pdf
    • http://mitefakosutupot.22web.org/acuerdos_de_paz_con_las_farc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d2688cda-c71a-4d76-9ad3-3c5703d9ab98/basiwugejosomikewarajaj.pdf
    • http://bifiwapaz.onlinewebshop.net/zazini.pdf
    • https://s3.amazonaws.com/lezerawe/32937833395.pdf
    • http://xiramubete.rf.gd/atm_machine_user_guide.pdf
    • http://fanalejowegop.atwebpages.com/bagamunigerijigepapo.pdf
    • https://s3.amazonaws.com/vososasoxumete/job_telephone_interview_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/2e3c60ad-edb7-45e2-a122-43f6d9d13b82/java_gui_programming_download.pdf
    • http://jelomasulavi.atwebpages.com/fazekasugotore.pdf
    • http://mibawojerasubuw.rf.gd/how_to_use_commas_with_prepositional_phrases.pdf
    • http://vipaviveza.epizy.com/ielts_writing_vocabulary_band_9.pdf
    • http://tirevotijo.epizy.com/lidewodobutujiziko.pdf
    • http://lulubanidoz.rf.gd/xitejoxikinoladobujixen.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e22d.bin
99a50dae4fab7849f9b072bda8b034d0c10cfb64ba38d5c0193e5e24a48f21cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 5328 bytes
font_01_sfnt_off0000f43f.bin
ac094cdb8bc58ebc453a773b392c59d9e268ca39a64027b97f6ed930312795e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 12008 bytes

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