Malicious PDF — malware analysis report

Static analysis result for SHA-256 4175c7dc6c20b81e…

MALICIOUS

PDF

65.9 KB Created: 2020-12-30 20:43:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e0a101d971c117ab657dc83028635969 SHA-1: 1ab4429229b53f6ca56db161cb476efc6ceb1f5d SHA-256: 4175c7dc6c20b81eec64345ec411a7140d02e01f9b7c8561579546c28045407e
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-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.
  • 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://traffset.ru/strik?utm_term=blue+apron+recipes+last+week PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471513/normal_5fb4d6f245cfe.pdfIn PDF document text
    • https://melejorun.weebly.com/uploads/1/3/0/7/130775242/283074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_5f9e46a144f46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375894/normal_5fcba77a2dfed.pdfIn PDF document text
    • https://dazowuxope.weebly.com/uploads/1/3/4/3/134319454/4964218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393188/normal_5fb435edc31df.pdfIn PDF document text
    • https://cdn.sqhk.co/walumupo/jyONib3/simple_modern_house_design_plans.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5fd664d40e253.pdfIn PDF document text
    • https://zivozisexime.weebly.com/uploads/1/3/2/8/132814465/kezixele.pdfIn PDF document text
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/verinowelalej.pdfIn PDF document text
    • https://cdn.sqhk.co/wejupexuput/XifmjeO/62812571062.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/roware/xolesumasukepovege.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/88756789735.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/50217593569.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_off0000c5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BB 5132 bytes
SHA-256: c8919461a702619b2b1fcd59e91102d9fb1faa92e68a651c641dd80f1ff1fdd2
font_01_sfnt_off0000d755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD755 10576 bytes
SHA-256: e60187e54285081285900be0aa01ed35cc21ff8eb25853623501d4e48ee83530

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