Malicious PDF — malware analysis report

Static analysis result for SHA-256 535fb5e24c5abc4d…

MALICIOUS

PDF

81.9 KB Created: 2021-04-03 17:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cf3b67764681f7436b1b0dbf3fc6577c SHA-1: ec7cd0cc92decf5e6cb80f86342b18888d77af37 SHA-256: 535fb5e24c5abc4da7541da4e21f9bf1c21cd5785579a6ee27240d370ada73b4
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic or distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document's apparent purpose of luring users to download content align with a phishing or malicious download attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=pretest+emergency+medicine+3rd+edition+pdf+download PDF link annotation
    • https://zepifuvuxetota.weebly.com/uploads/1/3/6/0/136095774/jiwajotisa-weluv-xawakuwuno-zuwunofita.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/nedazanaged.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458839/normal_5febf1c0247e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_601eb8a5a7531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487662/normal_604a4ca124c54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499351/normal_5fee0b4b4cea7.pdfIn PDF document text
    • https://naxekagaxobu.weebly.com/uploads/1/3/4/4/134477821/xutokatenisi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469378/normal_5fcd886e873ec.pdfIn PDF document text
    • https://zobagitolofoxaz.weebly.com/uploads/1/3/0/7/130739917/vujoxob-morariju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376875/normal_5fddddfe16bff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_6054769291995.pdfIn PDF document text
    • https://luresigixake.weebly.com/uploads/1/3/5/2/135294948/lisubigugifew_wogev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491671/normal_60471ad200cc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_60685094b186a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500882/normal_60130e8ad1d61.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/libosokune/6647513396.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/whatsapp_animated_status_video_song_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/1777390616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d4a23ff-2091-44dd-b914-c955a4bb66d1/tadurozusubeduxisovovesif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b74de6-f4a3-4910-9bdb-ce68e1d56202/what_items_do_i_need_to_wash_my_cartilage_piercing.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/51584165365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0609c18-3bb4-43da-855f-57547375dd05/nawuzekuvaba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C3 5832 bytes
SHA-256: 6f303949ef038a70891c83cf75cf508c6c107bffe808658bb543b67eef46f02d
font_01_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 11532 bytes
SHA-256: 0f2e3d0d4fa21f7fec2bcbfe41dc153eb6ed963f298cbf468b725a88a00499e3

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