Malicious PDF — malware analysis report

Static analysis result for SHA-256 28959bac9d517f82…

MALICIOUS

PDF

65.6 KB Created: 2021-03-23 06:15:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5369a2ca4b1777e9c6ce4147d7e1665 SHA-1: a3f5760fe9f79a5f5bef31ea9ff2cf0e95170656 SHA-256: 28959bac9d517f824299c791087528969162e265ebfec02f7bc00da4adfb5053
124 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, with a high concentration on disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9539

Heuristics 4

  • 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
  • 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/aws?utm_term=how+to+connect+tower+speakers
    • http://lajibodomemebev.66ghz.com/video_editor_for_windows_8._1_free.pdf
    • https://cdn-cms.f-static.net/uploads/4404293/normal_603983d4a1f55.pdf
    • http://itasda.online/58592709002xbsh4.pdf
    • https://cdn.sqhk.co/repejuvovod/jeqjhbF/now_goal_football_live_scores.pdf
    • http://bupetud.xyz/city_of_encinitas_stormwater_bmp_design_manualczgup.pdf
    • https://cdn-cms.f-static.net/uploads/4414176/normal_604683eb31311.pdf
    • https://cdn-cms.f-static.net/uploads/4466679/normal_603d8a33ea7e4.pdf
    • http://xawamiwupajev.mygamesonline.org/auditor_fiscal_do_trabalho_edital.pdf
    • http://winefesa.22web.org/9046696773.pdf
    • http://ufenmac.com/what_does_mfw_mean_in_textedk3v.pdf
    • https://static.s123-cdn-static.com/uploads/4461245/normal_60071b5f057b7.pdf
    • http://esclub.pro/galore_park_english_year_5_answersxbyb9.pdf
    • https://static.s123-cdn-static.com/uploads/4445118/normal_600657b39d7ec.pdf
    • http://palikexifumalam.mywebcommunity.org/what_is_the_secondary_heat_exchanger.pdf
    • https://cdn.sqhk.co/nuvurero/ajbjaja/namakuvan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_ff5fc3269f9d4b1e89e8f2cb606eac45.pdf?index=true
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_63f07a35e1134ea38c560560ba8607ea.pdf?index=true
    • http://womawujun.atwebpages.com/acer_aspire_v5-431p-10074g50_mass_spec.pdf
    • http://petojijoxura.onlinewebshop.net/99226018563.pdf
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_cb576ab7e91e4b2faca81f9f4d1c6506.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79d.bin
0d0db3d7500a151fd3a5ea9ee694b70c22d78a2ad943b5eec45cc5ffed099876
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 5012 bytes