Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aee84db2fcd9472…

MALICIOUS

PDF

74.5 KB Created: 2020-12-06 06:30:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 124220b68968c4d6949c94965da6acd0 SHA-1: 2d91a90f687f43f6c172593c9cdc6a95560eff7e SHA-256: 1aee84db2fcd9472f41a1de0cc373d9e57f376ee6d64ab349f990c94e4757179
156 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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one pointing to 'trafffe.ru', suggesting a phishing or link-farming attack. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

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
  • 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.
  • 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://trafffe.ru/123?utm_term=chris+stewart+nhl+wife PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5fc886fb9fc57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480595/normal_5fb020b362512.pdfIn PDF document text
    • https://kozugirufeji.weebly.com/uploads/1/3/4/8/134884007/ad1c5fbcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_5fa77ef8c9139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483338/normal_5fb8ab3f2325e.pdfIn PDF document text
    • https://jorokepevi.weebly.com/uploads/1/3/4/6/134688072/a2de6296af2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481515/normal_5fbbe76f132d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459058/normal_5fa893cac7a50.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/bolovopizonuki/free_messenger_bot_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/zoxosiliritikukokubesew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/715122a3-6ef3-4c65-8ab0-e683d957867e/warifoguzetenafimumeg.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/wovixesunewewake.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/bioremediasi_pestisida.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_off0000df25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF25 4852 bytes
SHA-256: d86e7d79abcba173476c475ea797827e008441845119bd0228c7381436446249
font_01_sfnt_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 14784 bytes
SHA-256: 57c95bd8b074e150cfbcefe06dbcac46a648cd8df1f2bfc24bb2a219b82814f0

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