Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9aad856e9e9d42f…

MALICIOUS

PDF

74.2 KB Created: 2021-01-06 05:38:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 40e3be38fe15a8205b8ecc953588e594 SHA-1: cd123f7c754e513794fbaffe270ec8c43582cc2d SHA-256: c9aad856e9e9d42f6fef93759a88115c5c1948e37744f0bd9bd4c8b414dd8e18
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to appear as search engine results for free movie downloads. The presence of a 'download button' heuristic and a high ML score further indicate malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms its malicious nature, likely serving as a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/wb?keyword=all%20my%20movies%20free%20download%20websites PDF link annotation
    • https://xebuwonivaxatev.weebly.com/uploads/1/3/2/6/132696015/datexadixigej.pdfIn PDF document text
    • https://xaredeni.weebly.com/uploads/1/3/1/8/131871979/nesofojozu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452835/normal_5fe3a21da2bf8.pdfIn PDF document text
    • https://xuwudobuxu.weebly.com/uploads/1/3/2/6/132682441/juwinez_numekogabapote_simovokemut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377112/normal_5f8c38b74bcf0.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/jjIhbrB/48713128359.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3597e3a9-0a5e-435b-92d9-f790d0941dbb/vobar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc6f357-e854-42e8-bcab-aef929e9185c/81239076466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1890d63-31f2-4f89-90f0-dbbe14a43947/lekumugezasapusaxegewufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02902d0a-7a2a-43c8-a6eb-8ac48db7c931/39634235575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/813a9335-2d51-4cc1-b6e1-797b9432390b/les_combustions_4me_exercices.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD930 5224 bytes
SHA-256: 582a13919f526c7b4cb03b039c4276e95058b46d3ec5572e60388edf0027a2a8
font_01_sfnt_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 10184 bytes
SHA-256: 64d70da79b94d2626de3f3714e74b0128e49db2dbcf7b12982d0fbf058237d29
font_02_sfnt_off00010db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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