Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b6fac98316977f…

MALICIOUS

PDF

77.0 KB Created: 2021-02-03 09:52:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d5c97338c68f826342ab6127d4d2c0e3 SHA-1: cfc62b339334399a705383c1847e9439085cbd6e SHA-256: 24b6fac98316977fe5a3b0e63cc4fb3b0654ff06270f92ea17e9d915061421ee
192 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure related to 'date sheet of class 10 2020 icse'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to phish or deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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
  • 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://crophysi.ru/aws?utm_term=date+sheet+of+class+10+2020+icse In PDF document text
    • https://static.s123-cdn-static.com/uploads/4465257/normal_5fffb4a23254a.pdfIn PDF document text
    • https://moworanapubo.weebly.com/uploads/1/3/4/6/134685821/2661392.pdfIn PDF document text
    • https://cdn.sqhk.co/gefeloxo/Ehjjjgi/survival_quest_symbiont_1_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492536/normal_5fcff66b5f053.pdfIn PDF document text
    • http://dijawobal.iblogger.org/mcgraw_hill_education_math_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/givikufat/he9cjh9/mepedazigukabefunububow.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/rodajijukadagidaboj.pdfIn PDF document text
    • https://zelelifejoba.weebly.com/uploads/1/3/4/3/134321633/wozenewosowi-zonizizuda.pdfIn PDF document text
    • https://cdn.sqhk.co/zolokike/dicicgj/54437394860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_5fe8574bcbf3e.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/hbiihja/45016180925.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wipidomi.rf.gd/86556849414.pdfIn PDF document text
    • http://mefuxunopurojim.rf.gd/65911933620.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/wivexazafozepoweturowa.pdfIn PDF document text
    • http://retetopipazaned.epizy.com/rewodoboralevitewu.pdfIn PDF document text
    • http://fokoxowikelejex.rf.gd/bpsc_online_registration_form.pdfIn PDF document text
    • http://nakepusigazu.epizy.com/babar.pdfIn PDF document text
    • http://roxonolabixatox.epizy.com/foduzepowu.pdfIn PDF document text
    • http://lofapubuwuleto.epizy.com/feses.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_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 5196 bytes
SHA-256: 09c48154e98304147354fd3fc10989dda596f4c8774850f2a75dd51b93f9d5ca
font_01_sfnt_off00010267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 10724 bytes
SHA-256: 1fda464675dd978e37492855b5aaf14051259b7606d850da8cb956f9d3584ac2

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