Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f0d1a8d3631cdd…

MALICIOUS

PDF

80.2 KB Created: 2021-03-09 06:50:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e4950d942f8d215858f2b2dccb028e8d SHA-1: 110bfb1d38cc5f251bad9a2f9bedec96c95727c3 SHA-256: c3f0d1a8d3631cdd501a7892d2615cc7f6924b7bf03df698ed2d380039472063
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a link farm designed to redirect users to potentially harmful websites. The presence of numerous external URIs, including one pointing to a disposable hosting domain, strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a likely intent to exploit users through deceptive content, possibly related to internship opportunities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://vilenefex.ru/123?utm_term=cold+email+internship+template PDF link annotation
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/feraf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426416/normal_601105892f8ec.pdfIn PDF document text
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/fejikajibepu_kopixiwogulage.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/68909234920.pdfIn PDF document text
    • https://zugufanebuloko.weebly.com/uploads/1/3/4/0/134016669/fetezetodebojan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470389/normal_5fc925335a546.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5ff89009027f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491965/normal_5fee732600145.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/how_to_set_up_a20_headset_xbox_one.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465702/normal_602a9a91ea017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jofeliruf.rf.gd/core_java_interview_questions_for_experienced_selenium_testers.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/introduction_to_tensor_analysis_and_the_calculus_of_moving_surfaces_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35bac6d1-a6e1-40c7-8bf3-62e302f86fac/zafoxuzoviwon.pdfIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_0b03a5447aa74171bf2e09e562e77960.pdf?index=trueIn PDF document text
    • http://wotidupodugi.myartsonline.com/singapore_math_workbook_grade_4.pdfIn PDF document text
    • http://tipakofixu.epizy.com/how_much_hp_can_a_stock_6.0_powerstroke_handle.pdfIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_65d47de7b7f64c2fbfa5e73c4bab98ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe9c70b2-8bde-4ded-8c2d-4cc48faad68e/2009_dodge_avenger_sxt_specs.pdfIn PDF document text
    • http://xiniwipilanaju.atwebpages.com/14027527297.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_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 5104 bytes
SHA-256: bb940ecd4354eded1d49db2fa73bfb47f32114168be35b66d9a8c3d57f53f450
font_01_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 11168 bytes
SHA-256: 995a45f2e05c00b2f2ae826bcadd5a50de73bfaef851c192532042f2dcbf82f4

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