Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db5140a144250dd…

MALICIOUS

PDF

65.5 KB Created: 2020-11-23 21:30:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f15734258f11ce43bb89bab196b9e15c SHA-1: e037ff74e3d553809d619275702b971a4abcdafd SHA-256: 8db5140a144250dd76ee3c505d96745a3e2018798b8a4c58f017be5fea657a4c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a link to known malicious redirector infrastructure and a large number of external PDF links. The ML classifier also assigned a high probability of maliciousness. The primary attack pattern involves luring users to malicious sites via a link farm, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=crepitus+and+false+motion+are In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_5f8a4baa930ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5f8b4d17d4247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387825/normal_5fa55a8bccfe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_5f973c8c56671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_5fa34aa85f193.pdfIn PDF document text
    • https://donibirumot.weebly.com/uploads/1/3/4/4/134463545/pebuvonijurato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5fa5006c69b52.pdfIn PDF document text
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/tineluvuxajikol_nopifezen.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/kilofupi.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/butuxutemiwevux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368244/normal_5f8829871bc66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5f8e23ac35501.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/wizuluworafid/lezuboz.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/540731034.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/14640779149.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/abscesso_peritonsilar.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_off0000c82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82B 5092 bytes
SHA-256: ab75c07243f96ba8261aee823ad0aea2dcd563f0b794cbb50fb17891aa3c9e58
font_01_sfnt_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 9352 bytes
SHA-256: 53389617154d2436d5fd1a113277099d13e481e85f27aa4596942a30159b410e

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