Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fe530aff6e0e51…

MALICIOUS

PDF

78.7 KB Created: 2020-11-11 20:04:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 77cfbe75bc39bf9bec426058ef008ed0 SHA-1: d0109d32595f1ca8af21ef09c2b1e0d6f255cce6 SHA-256: 89fe530aff6e0e5144020eeba2d791862549309a699b07d38ac48ed5c7e636c8
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to lead users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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.
  • 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/strik?utm_term=baixar+livro+o+desterro+dos+mortos+pdf In PDF document text
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/3425761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_5f87e09ae5b91.pdfIn PDF document text
    • https://zebazowis.weebly.com/uploads/1/3/4/3/134310266/befowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_5f9ad0c770487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5f910b2d42a1f.pdfIn PDF document text
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/d464fe74.pdfIn PDF document text
    • https://rovumixonisi.weebly.com/uploads/1/3/4/0/134012407/2121098.pdfIn PDF document text
    • https://numiduramar.weebly.com/uploads/1/3/4/5/134595515/83cbcf3fdd3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_5f98a7c2a1752.pdfIn PDF document text
    • https://dupasaku.weebly.com/uploads/1/3/4/2/134235895/541b3.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/blindspotting_screenplay.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 1872 bytes
SHA-256: 223568fc15723d408f00056d2cf6bf73ec0b5e81a44ab038b8d55cfaeb1c3c3d
font_01_sfnt_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 5364 bytes
SHA-256: 6424dde92bdbad861ae3b8aff6c53c251fcc8b888093f9ae00ad79ed72d4f859
font_02_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 13196 bytes
SHA-256: 85427eeeb14ca8bd409d4059b22887cbe6058d2708451a2f2897ca9397f2b1de
font_03_sfnt_off000116db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 16392 bytes
SHA-256: 34dc71cbf16051423a7e29848eb36e30b4cac13370fef2f9a7a1b6988dcf9d0d

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