Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebdd033a8f524af…

MALICIOUS

PDF

77.8 KB Created: 2021-04-08 16:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8f29c62f2f9bf852f532a96fac61c11a SHA-1: b5b88c306e5f141ab4ee2ead23d74e9739ec9859 SHA-256: 5ebdd033a8f524af31ccd348fde571624d9fbcc4f1da23386e9b1038126b8c11
194 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed for SEO manipulation. It contains numerous external links, with one prominent example being https://uploads.strikinglycdn.com/files/df24d3b8-53b4-4055-b94a-9f2003c870a3/english_grammar_download_in_marathi.pdf, which redirects to a suspicious domain. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=parkour+games+minecraft PDF link annotation
    • http://wowit.pro/354230706371j0vg.pdfIn PDF document text
    • https://wezalowesugalu.weebly.com/uploads/1/3/2/8/132815960/sojeja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489033/normal_603ceefea697a.pdfIn PDF document text
    • http://it50disconto.info/difference_between_viral_and_bacterial_infection_throat4jova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427506/normal_6058389c4ba3c.pdfIn PDF document text
    • http://moxilekulina.getenjoyment.net/50319665354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486745/normal_604a657253a5a.pdfIn PDF document text
    • https://semovililuf.weebly.com/uploads/1/3/4/4/134476677/mobuvezobovap.pdfIn PDF document text
    • https://sowotelimavo.weebly.com/uploads/1/3/4/0/134000290/387cb1a61ac76.pdfIn PDF document text
    • http://kernig.store/hungry_shark_mod_apk_unlimited_coinshy0p7.pdfIn PDF document text
    • https://xulijijexam.weebly.com/uploads/1/3/1/4/131453336/4242282.pdfIn PDF document text
    • http://sogixusi.medianewsonline.com/bogota_turismo.pdfIn PDF document text
    • http://azakalaza5.xyz/lonunopozezigaww01z.pdfIn PDF document text
    • http://xebubux.sportsontheweb.net/ganonogarokisuw.pdfIn PDF document text
    • https://kopigipovivon.weebly.com/uploads/1/3/1/4/131484029/d1d323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380413/normal_600c379822482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476780/normal_602473524871e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/df24d3b8-53b4-4055-b94a-9f2003c870a3/english_grammar_download_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ed6f361-9854-4653-a33f-eb0722997304/how_to_convert_photo_into_paint_by_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea9e51e-0fa4-47cb-a051-34187e4add16/92252500010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/726119e2-e948-41a6-bfda-a566fe0f14dc/data_science_internship_paid.pdfIn PDF document text
    • http://fepusum.onlinewebshop.net/catalogo_natura_ciclo_14_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdaf8a8e-1b6c-4878-a8d2-e6776caf003e/sezisekitoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c7c6d2e-22ca-4f40-a627-fd1d2815e3bf/php_html_change_text_color.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_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 5236 bytes
SHA-256: 0b487b576bd34a360e861a7b80958aad6f829ab1b5efd6128f0eff9663523f11
font_01_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 10644 bytes
SHA-256: bb3c00b071803b538613d0080861b6a6d7d2a86b18099d4a2fb6436f0260f5e8