Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad57a4bebf63123…

MALICIOUS

PDF

93.6 KB Created: 2021-04-20 23:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b04eeec3713c8bf1b901a103fe850164 SHA-1: b1981135cf749e44b0bedf174ee5225777510afa SHA-256: 4ad57a4bebf631231ea0cb1bf1a707c70979d1010daa73e3be9a790a12ef0164
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with one specifically pointing to 'baarspo.ru/strik', suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is designed to host many links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=how+to+make+a+martial+arts+training+at+home PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483075/normal_604910f85314e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_6051bd44f32aa.pdfIn PDF document text
    • http://wusokamojifel.scienceontheweb.net/ebola_virus_structure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408864/normal_5fd15377f2991.pdfIn PDF document text
    • http://datifuxevewa.22web.org/fishing_weather_report_durban.pdfIn PDF document text
    • https://lonoguvuxa.weebly.com/uploads/1/3/5/3/135320471/48aea9666d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451365/normal_600b903964f98.pdfIn PDF document text
    • https://tesuxoka.weebly.com/uploads/1/3/4/4/134473976/savanemurerik_xuzen.pdfIn PDF document text
    • http://daduriwikoniza.22web.org/because_you_loved_me_piano_sheet_music.pdfIn PDF document text
    • https://poxejoretojav.weebly.com/uploads/1/3/4/7/134740271/68995b178.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/vadixibojob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4aee13d6-25fd-4387-acc0-519888fb290f/32417342394.pdfIn PDF document text
    • http://wixujovevimaba.epizy.com/6900815914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7580a0b1-a24e-4380-b9c7-65e95681309a/vizio_vo320e_replacement_stand.pdfIn PDF document text
    • http://xotaferuju.myartsonline.com/what_causes_water_blisters_around_mouth.pdfIn PDF document text
    • http://radiviwix.onlinewebshop.net/gigupiwokexusuwujusuzipu.pdfIn PDF document text
    • http://pomewegipezu.rf.gd/fundamentals_of_momentum_heat_and_mass_transfer_5th_edition_solutions_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b57ccda-2288-4ed8-84d1-67c4735f0c8f/soriwajibugidenilokobudog.pdfIn PDF document text
    • http://dawozisi.rf.gd/660_bus_timetable.pdfIn PDF document text
    • http://kaseborodemo.rf.gd/biophysics_and_instrumentation_book.pdfIn PDF document text
    • http://pubojisa.epizy.com/39246326663.pdfIn PDF document text
    • http://genolewedusu.myartsonline.com/ankylosing_spondylitis_article.pdfIn PDF document text
    • http://saperemobopiga.epizy.com/wunatuxidememuwukekeline.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 5004 bytes
SHA-256: 007c9d0046847269b22753086b66834238339fc169fa2e461aedfeffe6534b62
font_01_sfnt_off000136dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DD 10600 bytes
SHA-256: 38ea710ef2902e88ae7c09e66d51fba5afbe75e762c008170b6a87133077bbf0
font_02_sfnt_off00015adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ADC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378