Malicious PDF — malware analysis report

Static analysis result for SHA-256 29599055bd2ce7fe…

MALICIOUS

PDF

69.5 KB Created: 2021-03-16 23:21:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4874bac117b592bc77a0e556b252fff0 SHA-1: 56e3ae852e76bb8488beee06cc046b687fee31d9 SHA-256: 29599055bd2ce7feb49a8f12b6426a6502bc073ed443bf4b3be283542bb2aa7d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://crophysi.ru/strik?utm_term=yamaha+mg10xu+usb+interface PDF link annotation
    • http://thecet.xyz/murder_on_the_orient_express_movie_plot_summaryfcz8g.pdfIn PDF document text
    • http://xepuxesadara.mypressonline.com/arrl_handbook_2021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_6033c9c91bfdf.pdfIn PDF document text
    • http://dibiwarisogix.mygamesonline.org/differential_amplifier_working.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427085/normal_5fcaa426edc14.pdfIn PDF document text
    • http://bidetoluji.getenjoyment.net/dimilajer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392862/normal_5fffb32aa7d49.pdfIn PDF document text
    • http://erogan24.website/71937933762qqes4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_601b9f034a69d.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/bufexa/80619726896.pdfIn PDF document text
    • http://lidiwerefibe.rf.gd/ff_cheat_sheet_2018_ppr.pdfIn PDF document text
    • http://nidumodosiw.rf.gd/stats_sa_census_2020_results.pdfIn PDF document text
    • http://lulojoduvos.epizy.com/95801362250.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/20756791614.pdfIn PDF document text
    • http://zegiwewezenaro.myartsonline.com/wawipemuwefonijewukereda.pdfIn PDF document text
    • http://vugikalijuboxo.epizy.com/centering_sheet_renting_services_in_chennai.pdfIn PDF document text
    • http://vowafipefazasex.epizy.com/activate_office_2013_manually.pdfIn PDF document text
    • http://rogidisili.rf.gd/how_to_change_ink_in_canon_p170-dh.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/is_ncert_enough_for_jee_main_inorganic_chemistry.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_off0000d0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D4 5628 bytes
SHA-256: cf162f370ab4dda79b59088ccd82a5bfd6a6585d36153262b1163f2b6863f1d5
font_01_sfnt_off0000e3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DC 10848 bytes
SHA-256: 0d012d3bd75a85924963bf52fa2d8556a829520baeabca3f0609efaa3dbf7dc0