Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4a91ac55812652…

MALICIOUS

PDF

69.0 KB Created: 2020-12-18 21:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e52012e9a7554d8a8126b48c5ae2a6c5 SHA-1: 6a5469039ff0a2283aa7f827c16936fa2592c556 SHA-256: 9b4a91ac55812652deda51d604a04227e60ff0c2eae4705592f0ef9c1c3c1963
214 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, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one identified as a known malicious redirector. The presence of a link farm suggests an attempt to manipulate search engine results or distribute phishing content. No scripts were extracted, but the embedded links are the primary indicators 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
  • 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://ggtraff.ru/123?utm_term=bluetooth+controller+pc+lag In PDF document text
    • https://juwujumatel.weebly.com/uploads/1/3/4/0/134042908/07c8b.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/752275.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496216/normal_5fccfcb720af3.pdfIn PDF document text
    • https://tubefirijivu.weebly.com/uploads/1/3/4/3/134351006/a2e7a4b762e5bf.pdfIn PDF document text
    • https://lotuliwupufak.weebly.com/uploads/1/3/4/8/134873452/738f03df6.pdfIn PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/telifinexazakomeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0d785085bf90c0efcc6ad/t/5fc34cbd3570fb44d16d25e5/1606634685790/jexoxemem.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/another_love_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/21897043269.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/fibujesasiwufuz.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/tasuxulalalalalegojazo.pdfIn PDF document text
    • https://s3.amazonaws.com/juxatop/guideline_value_streetwise_salem.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_off0000d1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E9 5064 bytes
SHA-256: a134d72dbfb2721e60328a2b2034d69c8c55e6918e77035d6a889fbb5b2c8047
font_01_sfnt_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 10580 bytes
SHA-256: 707114093665feeaec26877d0250df6839bf83fbada3bedc0fbef9d9324662c8

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