Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ff1dde7a5166a8…

MALICIOUS

PDF

71.0 KB Created: 2021-03-19 21:23:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 038e74675c978bff8f89d2625ac160d6 SHA-1: 781fdd8951730bf0c04dc9332b45dfb4cc238c1b SHA-256: e6ff1dde7a5166a88f20fb43ad4f57c3446ae53d112da66d462ac38b541e70d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The ClamAV detection further confirms its malicious nature. The primary URL, https://xezojetit.ru/strik, is likely used to redirect users to a phishing or malware download page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=geometr%25C3%25ADa+y+trigonometr%25C3%25ADa+baldor+nueva+edici%25C3%25B3n+pdf
    • http://vudifabofugejij.medianewsonline.com/arpeggios_piano.pdf
    • https://cdn-cms.f-static.net/uploads/4495385/normal_6041639451070.pdf
    • https://cdn-cms.f-static.net/uploads/4383703/normal_5fe7499bef5b5.pdf
    • https://cdn-cms.f-static.net/uploads/4377388/normal_60415de716f1d.pdf
    • https://pogipusuzifu.weebly.com/uploads/1/3/4/8/134869227/38810.pdf
    • http://mevixonur.mywebcommunity.org/april_2020_calendar_wincalendar.pdf
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/978ae190.pdf
    • https://pofekabebo.weebly.com/uploads/1/3/0/7/130739116/28430fdda2.pdf
    • https://webuwexuzebonal.weebly.com/uploads/1/3/0/7/130775053/7006394.pdf
    • https://cdn-cms.f-static.net/uploads/4453720/normal_6048a58c60381.pdf
    • https://cdn-cms.f-static.net/uploads/4410004/normal_6045e48d65dfb.pdf
    • https://cdn-cms.f-static.net/uploads/4374379/normal_6018029a038e6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sufixis.myartsonline.com/jazaranuselivuziv.pdf
    • https://s3.amazonaws.com/lekelepowo/trevor_noah_born_a_crime_summary_chapter_2.pdf
    • https://s3.amazonaws.com/fomaralunex/24514583465.pdf
    • http://mobukug.myartsonline.com/84289588938.pdf
    • https://uploads.strikinglycdn.com/files/a2eed177-2571-47b6-baa1-0c6e69b06234/kamogubifogolezumanodipa.pdf
    • https://uploads.strikinglycdn.com/files/c7f3b582-ea5a-4ec8-bd2a-b0aebf4faa82/panasonic_sd-yd250_bread_machine_recipes.pdf
    • https://uploads.strikinglycdn.com/files/e2da30d9-a197-4f75-bdab-d5ef047a79ae/latest_amendment_in_section_138_negotiable_instruments_act.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d341.bin
7df650fdba2aa57e871637e8aa9cb33403431ac98112d3571608a035fe2be424		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD341 5820 bytes
font_01_sfnt_off0000e6c7.bin
6ffcd345d95ebf35a505a725fcad2a0f68f2446ae0afc91329c21937b5782e33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 11400 bytes

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