Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca68290396dfb2c2…

MALICIOUS

PDF

72.7 KB Created: 2021-03-14 02:26:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0bd7cce5862c29823db047709d12f707 SHA-1: ebe0e5db7932917d98c18c366d1248be9d81181c SHA-256: ca68290396dfb2c2d347b7f47a1de25588afdcb914ce845761898e08e989e6e6
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URLs disguised as academic content. The PDF_SEO_LINK_FARM heuristic indicates a high volume of links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. While no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence score point towards a malicious intent, likely for phishing or malware distribution.

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
  • 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://kuzutuzo.ru/award?keyword=jurnal+endometritis+pada+sapi+pdf PDF link annotation
    • http://coolvdomaion.online/bagupilawujekazazipipufaze7cp5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498882/normal_5ff9ecab728db.pdfIn PDF document text
    • http://yewes.space/craftsman_lawn_mower_parts_model_917f6lcd.pdfIn PDF document text
    • https://viradigoposexa.weebly.com/uploads/1/3/4/3/134383508/76a6cfae552469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_6047ec8c72d37.pdfIn PDF document text
    • https://pefobasor.weebly.com/uploads/1/3/4/1/134131397/jusebofexagafofazur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445754/normal_5ffc2e640601d.pdfIn PDF document text
    • https://zadevadetolilug.weebly.com/uploads/1/3/5/3/135321342/7a160700208ad96.pdfIn PDF document text
    • http://biomanua.website/2005_buick_lacrosse_heater_core_replacement_costgoomw.pdfIn PDF document text
    • https://povizizumor.weebly.com/uploads/1/3/4/6/134636509/luzaxasid.pdfIn PDF document text
    • http://nasporte1.fun/minority_report_dual_audio_720p66rhn.pdfIn PDF document text
    • http://cardioactiveitalia.site/interview_questions_for_math_teachersvwco4.pdfIn PDF document text
    • http://sutiboju.sportsontheweb.net/gofaretu.pdfIn PDF document text
    • https://posodagesifip.weebly.com/uploads/1/3/4/8/134874027/xenufufevudaziz.pdfIn PDF document text
    • http://pepariravifaza.getenjoyment.net/aqa_a_level_biology_revision_notes.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/vuzufexarevima/50346277409.pdfIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_98b0da57456f4b798371fcd915e24343.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xapota/drastic_ds_emulator_apk_for_android.pdfIn PDF document text
    • http://nupuzawov.onlinewebshop.net/guvux.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_79b618ad58a74124a886ee4d0a93a995.pdf?index=trueIn 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_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 5176 bytes
SHA-256: bebcec7d4acb78d854025b980a4404d17f0a0c3fb90b45be6cab82978854a4a2
font_01_sfnt_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 11456 bytes
SHA-256: d870557f1a9ad6817b9010f41f23ffe72f006a102a520c10bcd145bae9a3b5ca

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