Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dc70e5c41708de…

MALICIOUS

PDF

68.0 KB Created: 2020-11-10 11:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 07c24ab6e3711ca8ab0fdb4cfa2e86a2 SHA-1: d9a5c4fd2478dd38bbb88b2650ce9312b444cb28 SHA-256: c1dc70e5c41708debbed1e306fe161f66cf38befcbdacc4abe5df9a6c6a638f0
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 0.9998

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://trafffe.ru/strik?keyword=resident+evil+revelations+2+trophy+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387410/normal_5f962f73c17d0.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/gumupivuve-jadufojuxawuj-mofikurima.pdfIn PDF document text
    • https://wilewefat.weebly.com/uploads/1/3/4/2/134234777/polixur.pdfIn PDF document text
    • https://gutomaxitokivi.weebly.com/uploads/1/3/1/3/131383747/9452095.pdfIn PDF document text
    • https://ruzizoradum.weebly.com/uploads/1/3/4/3/134317959/8401595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462093/normal_5fa25e53dafa4.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/sorogamat/48400338184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3a85169-93d5-49a1-bd9c-e098dd5f504d/herramientas_de_inteligencia_de_negocios.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/74873061524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c13157f4-f16a-479c-b7a8-f4b48c46384b/motejitaduzal.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/94788352048.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/bigajamuwukalutiwowekale.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/72677605082.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c5f490c-bfc9-44e0-b128-751081928bd8/13472393769.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_off0000cd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0E 5520 bytes
SHA-256: 7378d49a899e31cceca8f3e09ae6848f8b8986f715fb9334e07df626a17b65fc
font_01_sfnt_off0000dfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 10404 bytes
SHA-256: d492b124f68ae395e9f994958f44b3dd29f13ca8ebfe513197538a4478305834

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