Malicious PDF — malware analysis report

Static analysis result for SHA-256 c636f573e6d579b6…

MALICIOUS

PDF

72.1 KB Created: 2021-02-28 02:06:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 57b6fe77d3caee91794fa5dffc582c47 SHA-1: d85cdae7803a7e3d1bf906ecb0c0afc37351fc33 SHA-256: c636f573e6d579b6b85e86ef2c5e499683054dfddc80aaaea3cc3dd0f1a378ce
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://pelibifir.ru/award?keyword=how+to+adjust+the+pressure+on+my+pressure+washer PDF link annotation
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/9dec282.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/dNKoijG/gisanujofafi.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikalamo/2hfbdih/71222338303.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401540/normal_5ff9eb770bd98.pdfIn PDF document text
    • https://puluzoxaxidu.weebly.com/uploads/1/3/2/6/132683087/tarubepepal_jubob_xixosinu_tuvebifel.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/6tNheji/audio_buffer_size_android.pdfIn PDF document text
    • https://tofexozulemun.weebly.com/uploads/1/3/0/9/130969243/7cce26a55f2e748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_5fd715e2cfbe5.pdfIn PDF document text
    • https://walikuroxora.weebly.com/uploads/1/3/2/8/132815001/reninisunis-towinojulo-rotazi-riravu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_600c03735ff34.pdfIn PDF document text
    • http://finonit.mypressonline.com/92109225401.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/f3Zidwp/glass_water_bottles_1_litre_online.pdfIn PDF document text
    • https://gagufivelorifig.weebly.com/uploads/1/3/4/5/134596616/4827489.pdfIn PDF document text
    • https://lavabowigu.weebly.com/uploads/1/3/2/6/132682694/a2f933c178c40e5.pdfIn PDF document text
    • https://xufizuwerab.weebly.com/uploads/1/3/0/7/130738786/zavijomalageweba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 5400 bytes
SHA-256: 1d0a4f7dc23b1ed70f5ae81ece6bd6798200d016f3adb5df735cb3a77c57ca20
font_01_sfnt_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 10304 bytes
SHA-256: 361ef6736fa4c3b4b49ae1efe92cfd50f32ba5aee139669e4da3f2fe6bcc9c10