Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1625354f0a092d1…

MALICIOUS

PDF

75.2 KB Created: 2020-11-23 19:03:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b9885a738095e19f922f704dcf19afe9 SHA-1: 1de1cb3075a4e15179fbe18ae04315f76546e46b SHA-256: e1625354f0a092d1788cbe4e0279fd59a30ae829db21ba9c7a1f07efbf31777a
214 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, with one critical heuristic identifying a link to known malicious redirector infrastructure. Another heuristic indicates a PDF link farm, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

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://gettraff.ru/strik?utm_term=act+reading+practice+test+with+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408721/normal_5fa21ccf16611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447914/normal_5fa487112cd85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_5f952845c68ad.pdfIn PDF document text
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/danuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5f88c8d5006ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393511/normal_5f9ca1ef830f5.pdfIn PDF document text
    • https://tumegifokax.weebly.com/uploads/1/3/4/2/134235775/xunogeri.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/toxose.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/c343e85b-b4d5-46ca-8963-974d9083d612/91497867574.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/nafipazodamufumafegip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85508e1f-d3ef-4bf7-af40-9981798a7c0b/vocal_range_finder_tool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5385f961-d95a-4eac-8214-ef6b0d66ce94/fiduxodekegitelomesavitad.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_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 5548 bytes
SHA-256: 2bb6b812590209e9903dfbbe57ea709bb5e213b2c9e16c4dae55f67c8c04ef44
font_01_sfnt_off0000fbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 10636 bytes
SHA-256: e7937f9c29f3c8759625d99b8553064a94b91122005af5265ce7832d00f3b5e5

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