Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f6ea2dd9018781…

MALICIOUS

PDF

103.6 KB Created: 2021-03-03 04:01:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c8d4e278f25b43f3c62729e92fdf50f5 SHA-1: 990688096c29aea5bb47e13d6996e13add2a40e9 SHA-256: 25f6ea2dd901878115b12633adccc194d49cb9bf3dc5a6bf51a58150a49fe7f5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/123?utm_term=sql+for+dummies+2020 PDF link annotation
    • https://liziruji.weebly.com/uploads/1/3/4/3/134380663/5750550.pdfIn PDF document text
    • https://gatokoliza.weebly.com/uploads/1/3/0/7/130739470/xupevuzubikirudir.pdfIn PDF document text
    • https://cdn.sqhk.co/pusuvizodez/jhdgfGt/3d_heart_project_ideas.pdfIn PDF document text
    • https://xowuxuwakewobi.weebly.com/uploads/1/3/4/8/134853014/fugerogujiza_mezugejo.pdfIn PDF document text
    • https://vizifota.weebly.com/uploads/1/3/0/9/130969876/kenatukak.pdfIn PDF document text
    • http://vostokzapad.su/company_of_heroes_legacy_edition_vs_company_of_heroesm543g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416806/normal_60128151eaf36.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/mNWhYjg/big_bike_magazine_test.pdfIn PDF document text
    • http://aycotoro0.xyz/microsoft_wireless_notebook_optical_mouse_4000_drivereabom.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/jaidjcM/five_nights_at_freddy_s_2_unblocked_hacked.pdfIn PDF document text
    • https://radufogerexe.weebly.com/uploads/1/3/4/2/134265868/1555122.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/i78Icii/adjustable_fold_up_table_legs.pdfIn PDF document text
    • http://lnstagramcentre.net/leap_day_william_30_rock_giffh7ea.pdfIn PDF document text
    • https://fujifarilopo.weebly.com/uploads/1/3/4/4/134483008/7457831.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405459/normal_5fc5e1bb45e17.pdfIn PDF document text
    • https://mirotimazafisel.weebly.com/uploads/1/3/4/3/134352803/5815918.pdfIn PDF document text
    • https://meluwirukumipi.weebly.com/uploads/1/3/1/4/131483006/e1a4a3eca8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/garorowa/57144103098.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/best_hotel_booking_websites_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/39484735383.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/cartoon_couple_hd_wallpapers.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/89379708197.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001629e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1629E 25372 bytes
SHA-256: 20e8e423896d0a5cd2b5b178d00df5e6ad6fa1304c747c696e99c23864d7c520
font_00_sfnt_off000128f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 5344 bytes
SHA-256: 7e4a5632b8aeee05b018dc0951a4afd95af6a2422ea22738565a83823160dd07
font_01_sfnt_off00013b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B14 11524 bytes
SHA-256: 9c55e3b284994bb33a22d2a077e3b317adbadc429973bca909352f705aa5077f