Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfba8468b4f34cb…

MALICIOUS

PDF

83.9 KB Created: 2021-01-15 04:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c85ce2f573bd1c4e2762cd88b65f3b9d SHA-1: 7b1ece8a362c57d19712a202637843a3aa0d3c66 SHA-256: dcfba8468b4f34cb354e0a67b5613bbcfc19dc3b21dbb29105ac3fef16616c58
222 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, with a high ML classifier score and ClamAV detection. The embedded URLs, such as 'https://cctraff.ru/aws?utm_term=free+psd+billboard+templates', are likely used to direct users to phishing or malware hosting sites. The presence of numerous PDF links suggests an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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
  • 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/aws?utm_term=free+psd+billboard+templates In PDF document text
    • https://denasigetul.weebly.com/uploads/1/3/4/3/134332190/wowefavuw_gowerozewixe_tanofivu.pdfIn PDF document text
    • https://kirewigofe.weebly.com/uploads/1/3/4/3/134382955/84441.pdfIn PDF document text
    • https://site-1173522.mozfiles.com/files/1173522/production_order_confirmation_report_sap.pdfIn PDF document text
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/f59b9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451225/normal_5fe3a9b7a391c.pdfIn PDF document text
    • https://kowagazobavov.weebly.com/uploads/1/3/0/8/130874359/gupakoleniv.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/rurosaveruk/suzoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/25550876623.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/17018016049.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/rbc_covered_bond_monthly_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/tosotitukabenan.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/slope_intercept_form_with_two_points_worksheet.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_off00010dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAC 5200 bytes
SHA-256: 21f6e6a0851ccd5a6861c6356f0f1d7e26e5a60cd9138a126362109a28303932
font_01_sfnt_off00011f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3C 10352 bytes
SHA-256: a7a6fb834ce4bac21b3c00c1307c90043bd52b4cd94fbeb8456e46cba7b8c992

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