Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c8f3c6a116b0c4…

MALICIOUS

PDF

70.7 KB Created: 2020-11-18 17:01:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 731219d029131c815eebbbbe96d4f757 SHA-1: 2d6fbe3b10f816faa6c200d95ebe6814a4c803af SHA-256: 01c8f3c6a116b0c41216228fdf9df88af257fcf97294226dcfdc259daaf9b542
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, indicating a link farm designed to redirect users to potentially harmful content. The primary URL identified, https://trafficel.ru/strik?utm_term=guion+tesis+amenabar+pdf, is likely part of this malicious infrastructure.

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 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://trafficel.ru/strik?utm_term=guion+tesis+amenabar+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388037/normal_5f925534a84fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477892/normal_5fb509b8b1d62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393044/normal_5f8edac83d8da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5f936ae2dde1c.pdfIn PDF document text
    • https://lezunodukulo.weebly.com/uploads/1/3/4/3/134341823/nawisolulowozanut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414866/normal_5faeefcceef92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393904/normal_5f904fd998e89.pdfIn PDF document text
    • https://xesapidad.weebly.com/uploads/1/3/4/3/134346602/f46032bda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370066/normal_5fa18b408861f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f8ea048e098d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422645/normal_5fa04ccec1566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447877/normal_5f9d964e84210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_5f919b4c927b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c1b948-86bc-4c14-913f-01ebd8403c3b/xexavumokalonifajamatufep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50aefe33-03a6-48e1-abe5-c631af96e811/gelenilunobesegazinimu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64B 5328 bytes
SHA-256: 775832bcec1b34767808f526fc4a89991ef27a7ebf93490459e5475e5c21339d
font_01_sfnt_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 11236 bytes
SHA-256: cfc8104f60c309ffe453bb60c6cc3ab2caf7552bd321dc8bc84d12063292d765

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