Malicious PDF — malware analysis report

Static analysis result for SHA-256 6820cf4d778a533b…

MALICIOUS

PDF

71.8 KB Created: 2021-02-13 11:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 50adf47f91cb5dd36de111a529eaf251 SHA-1: 2d71715fc8440223e5675da220a4b86d222223e8 SHA-256: 6820cf4d778a533b6f1d223bf946d81e98e38eb63dbcfef1e0b092275b44913f
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=sous+vide+flank+steak+marinade In PDF document text
    • https://cdn.sqhk.co/gedugari/gji8Hgg/retro_arcade_games_system.pdfIn PDF document text
    • https://cdn.sqhk.co/vivupedasez/UQji1v4/60498540063.pdfIn PDF document text
    • http://forsage.pw/pububabazidikuluwakuzimx3iw4.pdfIn PDF document text
    • http://nesobaka3.xyz/plantas_c3_c4_y_camlwavd.pdfIn PDF document text
    • http://insurancecarusa.com/faxitonuzex4unqm.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/hg8hjHm/rovixotigakur.pdfIn PDF document text
    • https://kuvixirizu.weebly.com/uploads/1/3/0/7/130739951/761456d.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/j431jgF/penguins_isle_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/dBIKjAt/ikea_dresser_malm_brown.pdfIn PDF document text
    • http://mir23.xyz/dio_magica_202033rt1.pdfIn PDF document text
    • http://d2-club.ru/school_attendance_sheet_docfgtpe.pdfIn PDF document text
    • https://kowalarezanir.weebly.com/uploads/1/3/1/4/131438161/2741203.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424331/normal_5fec268ddf781.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuvawewopuje.rf.gd/side_effects_of_antimalarial_drugs.pdfIn PDF document text
    • http://rojapaj.epizy.com/dewalt_bench_grinder_dw756_manual.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_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 5280 bytes
SHA-256: e8af4d4d4caa4162fd524892c2283c9c04e968ff2bd494b96a6c8d83c6a8db61
font_01_sfnt_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 10680 bytes
SHA-256: 7c97b08eacef546675648fdf6c1d61a253d1564a6fdb29c8617a9166d7c69c6c