Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bde8e11977c808a…

MALICIOUS

PDF

70.0 KB Created: 2021-03-02 14:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3f9052c2e0befb15c817a592b48cfada SHA-1: 8fde6b82a4418b185d410f55683a161c855f6648 SHA-256: 3bde8e11977c808a25e3bbfbb2da02ff502b1aed6f1c3f29d8ff2d888284c0ca
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to drive traffic to malicious or phishing websites. The ClamAV detection and ML classifier also indicate malicious intent. The primary IOCs are the numerous URLs embedded within the document, which likely lead to further malicious content or phishing pages.

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://pelibifir.ru/strik?utm_term=what+is+the+purpose+of+structure PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495413/normal_5fdbcf4d5e522.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/jorezefobaromezofug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470977/normal_603afcd79903c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5fd12b0ccf4e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_601bb70b4656f.pdfIn PDF document text
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/tamawijo-mogefevaneteji-zeriwumesujut-duwifeporez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403687/normal_5ff98cafab94a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455881/normal_5fddfee6d1a08.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/hLxichc/idle_landmark_tycoon_hack_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474448/normal_5fe09775b2856.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/when_someone_winks_at_you_what_does_that_mean.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_6031679edfa4a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipanokule.onlinewebshop.net/3_basic_physics_equations.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_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 5084 bytes
SHA-256: b30fb02e12020413f42b73ab19b1f8d9319546eacfe4670817ca5eb389adf8ed
font_01_sfnt_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 10452 bytes
SHA-256: bf33633e2692ef52d77f1f474fb27832751c73cb271c52c36e58f2ce5aa67f30

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