Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c54fe31d92d22f6…

MALICIOUS

PDF

85.7 KB Created: 2021-03-25 14:49:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 70d3082af3b4e593895302178a768a4a SHA-1: b892bda4887bf9a6191ba8e8c314a97f8956a1b3 SHA-256: 3c54fe31d92d22f6fbf7b8feb8cecd928a50867cec25ed0a80bfb0a5a1ce91a4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://lozipotod.ru/strik?utm_term=what+is+typically+the+author%2527s+purpose+in+writing+a+memoir PDF link annotation
    • http://bumawusuka.mypressonline.com/jejirapavedaseno.pdfIn PDF document text
    • http://tazanup.mypressonline.com/definition_of_national_culture.pdfIn PDF document text
    • http://bostpolamos.site/pojarizupiwou5fg6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5fcdfd4f196c7.pdfIn PDF document text
    • http://forkidsshop.online/how_to_turn_on_humidifier_on_cpapz7sxp.pdfIn PDF document text
    • http://kawlites.online/jason_schaller_wikipediatzz1m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380383/normal_5fe5f36152f0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468531/normal_5fcd3431587d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409811/normal_6000a9bf9ac2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487184/normal_5ff962220effc.pdfIn PDF document text
    • http://begemotiks.space/mewokitafukuzusefo2wx0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417208/normal_600860ad60d34.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/pubiwoliri.pdfIn PDF document text
    • http://covidcapsule.world/mthode_heuristique_franaisgzmoy.pdfIn PDF document text
    • https://voteweze.weebly.com/uploads/1/3/5/3/135346586/zixabonigodabenonar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406516/normal_601bcf8048d15.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/xurixado/93095279569.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/darius_guide_tft.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/arcane_legends_mod_apk_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/veboxunabotibelupuli.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/bncc_atualizada_2019.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_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 5588 bytes
SHA-256: f9dfb169dc198e2251b59fe4ce62c0a6b526dff5740ba0a7311d23dc1c4a3e19
font_01_sfnt_off000125a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A4 10460 bytes
SHA-256: dbc49c7d8c6168282d042cd91ca42316a09471f7ca0488756f9708a70e82fb35

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