Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93189cabeeb6010…

MALICIOUS

PDF

69.0 KB Created: 2021-03-12 01:02:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b571855416ef70f42b35cac870f40d16 SHA-1: e2439a1eb20e08dabeeae7500ca95ffe9bcd8394 SHA-256: b93189cabeeb6010092a1fa6e1323f3534d1dfea427570b566bf1402d501c186
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, appears to be a lure related to relationships, likely intended to trick users into clicking malicious links.

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://zajinet.ru/strik?utm_term=how+to+have+a+better+relationship+with+my+parents PDF link annotation
    • http://koprovk.xyz/3678564691wzjex.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/how_do_i_turn_off_the_alarm_on_my_ottlite_desk_lamp.pdfIn PDF document text
    • http://fogimikolasot.iblogger.org/kiruxozedumugulewewezal.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/8292619896.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/oedipus_the_king_lesson_plans.pdfIn PDF document text
    • https://cdn.sqhk.co/puberufibo/gSMjche/fimubuxujoninapaxom.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/vosekepeli.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/Rghjghd/drift_x_burn_mod.pdfIn PDF document text
    • http://goodsfor.life/muvinizomizitifmofne.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/XXjjfkV/major_mayhem_2_mod_apk_unlock_all_weapons.pdfIn PDF document text
    • https://cdn.sqhk.co/wadalibituge/7atifh4/hitchhiker_guide_galaxy_towel.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/AheiQgf/marlboro_mega_ice_blast_price.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/e7f1af17-49f0-44b4-9a8d-9b17ea037096/95697899178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea8d690e-a257-4a1c-95c2-dbebfd474df7/90053030768.pdfIn PDF document text
    • http://dudadiba.epizy.com/what_are_some_therapy_techniques.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/zirofolavi.pdfIn PDF document text
    • http://moxosutemow.onlinewebshop.net/nidesipiturug.pdfIn PDF document text
    • http://bidajalej.onlinewebshop.net/1st_grade_alphabet_worksheets.pdfIn PDF document text
    • http://bolapapuziku.epizy.com/excel_vba_worksheet_function_standard_deviation.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_off0000d22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22C 5412 bytes
SHA-256: d33a734cd8bf16804fdb034183113af3570b7ab2229e2a043fd9e6d5f279308d
font_01_sfnt_off0000e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 10040 bytes
SHA-256: 309e4cd63cd0d604867c566669dd08e5576188a244157c415b968acb9a1e8b4f

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