Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8b18e60363cced…

MALICIOUS

PDF

77.4 KB Created: 2021-05-28 06:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 059cf25b56f08df20e33706b1a73ab63 SHA-1: 57183b4faf4c813984cdc6bc8bdc35ed4585ac3e SHA-256: fd8b18e60363cced3708209ac9eff328fedee762155d911e2862c4b19a4f73db
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-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.
  • 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://fokemale.ru/strik?utm_term=b1+level+english+test+equivalent PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371814/normal_6022556e9f5a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421787/normal_60206f7159a71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419204/normal_6039082908e42.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4377128/normal_60aff1066b30d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377662/normal_5fcdc9a8e37d1.pdfIn PDF document text
    • https://zutizogemene.weebly.com/uploads/1/3/5/3/135348028/gotozis.pdfIn PDF document text
    • https://xexasatokotubeg.weebly.com/uploads/1/3/4/3/134354060/pokewexakavutefeni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444096/normal_5fd3181d4263b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449996/normal_6000c91b53126.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447258/normal_600627e97b8e6.pdfIn PDF document text
    • https://ximofutaxa.weebly.com/uploads/1/3/4/6/134626718/8493244.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/149742f9-c20e-451a-975c-40d0b29d8259/bait_fishing_trout_rigs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9749fc94-72b0-4811-8d26-21f5bc5d9441/45773147732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18250d5d-9152-412b-96f9-f73117aaf3d2/do_thorn_birds_really_exist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f70cb4-4eb7-45ae-a10c-3cf800d373ff/wonumituvefugosa.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_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 5140 bytes
SHA-256: c1c0dbd5d5545f1a8b86c2cb705dc2752d93aa8a2ccf59be3b46c9774d8d2fae
font_01_sfnt_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 11172 bytes
SHA-256: 933349e69ad6ee456078c700e3a823aec6996985e3343a00f60b07ac28eea44c

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