Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ceac779a4ab750c…

MALICIOUS

PDF

95.5 KB Created: 2020-12-27 15:59:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 54ec831baaa09a5d8c675aa338465079 SHA-1: 2c9157490aa7440ca729a208d57915ac2ce61fb9 SHA-256: 9ceac779a4ab750cab7ef18a69ae042e65252ac7b4751c380920889b0a8dbed0
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 as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF SEO link farm. The file contains numerous embedded URLs, with the primary one being `https://cctraff.ru/aws?utm_term=coping+toolbox+worksheet`, which likely serves as a phishing lure or a distribution point for further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=coping+toolbox+worksheet In PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/a8401ec7a9859.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472188/normal_5fdeb4b0c9884.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368485/normal_5fcdb832e216c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411512/normal_5fceabf5eed0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380536/normal_5fd74feb93c32.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/3964817.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/gewisetug/wozerebekenitexaberaxeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3627e5f-aacd-4999-8096-61db5f041f59/sazatokarixuj.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/dovesufipana.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/niruxum.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/petrologi_batuan_sedimen.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_off000139fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FC 5140 bytes
SHA-256: 07f5508ed7e7a2ea7e869360084a019e4b7e9b83f3e636ef2543c63fc72b1d3d
font_01_sfnt_off00014b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B84 11060 bytes
SHA-256: 57914924618af13c4f359dfea8f9167b45d5f017bcb3112efd5cd8a45480f6b8

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