Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1758c54ab7c381b…

MALICIOUS

PDF

68.5 KB Created: 2020-11-11 14:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b3dbf1739a5f4b5816ed745dd7764705 SHA-1: 92abb2c95c20729d9a1832f3db8016c378c62a43 SHA-256: c1758c54ab7c381bd77f0f4b3ceb416e620a4671430f04538644b5275cfed1f6
186 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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/aws?utm_term=the+pearl+study+guide+chapter+3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370285/normal_5f9133f383d53.pdfIn PDF document text
    • https://dufavepuxafolim.weebly.com/uploads/1/3/4/2/134266173/2b4bca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5f8be7ef115b5.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/koxutosozu-xifuxo-vosezi-wonariweseged.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_5f9c0dac0140c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456134/normal_5fa45de5014d5.pdfIn PDF document text
    • https://purusoze.weebly.com/uploads/1/3/4/4/134495244/kifiwojuga-vamudasu-zexiz.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/2499678.pdfIn PDF document text
    • https://belabujogod.weebly.com/uploads/1/3/4/6/134696524/negil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401545/normal_5f9c486c0eb5e.pdfIn PDF document text
    • https://bisojobiregabo.weebly.com/uploads/1/3/4/5/134509607/vufufape.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/525a2344-199e-4504-869f-1da05b76d7cd/61800105041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b07523d-f5c8-451c-9884-5af5a9cb7eaa/diferencia_entre_parafrasis_mecanica_y_parafrasis_constructiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb49d22b-a495-4391-a82b-e538dc016a8a/1860408324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b97b2c6-21cd-4fa9-bba1-4226462b8f31/13155848117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff5bb9d-20bc-4a7e-9149-c7374a0d7653/remoride.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 7

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_off0000d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 5548 bytes
SHA-256: da65b865d3d6fafad14494e76424e094f15bf51f04803d14ac4b118abaf551f3
font_01_sfnt_off0000e453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 9488 bytes
SHA-256: 5e19eeea98b74abd42de012949c89bcb6df4f2981e7ad6e535d452c33d42fec9

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