Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce569133fe34d4f4…

MALICIOUS

PDF

75.3 KB Created: 2020-12-11 08:54:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4b03eead2d9594c8c6dfa6d7691a65e3 SHA-1: d21c4790aa44ce8b4f9ac03c533cfa8bda08f6f8 SHA-256: ce569133fe34d4f44cc254f6a865aec0a6bdc4398fcb54a21edda8bd2bcf31a1
234 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link disguised as a helpful guide for removing Excel passwords, which redirects to a known malicious URL. This tactic, combined with the 'Password-protected archive lure' heuristic, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=remove+password+from+excel+2013+worksheet In PDF document text
    • https://guxafewesev.weebly.com/uploads/1/3/4/5/134595620/matirim_kekijo_tiletefaruweki_pukej.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/9622818.pdfIn PDF document text
    • https://sixifemawo.weebly.com/uploads/1/3/4/4/134470876/9706344.pdfIn PDF document text
    • https://fikosaxan.weebly.com/uploads/1/3/4/7/134753192/7870091.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/bupijila/lesegataja.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd9b8ef7301f8b108504/t/5fc1ac97e6d49a06bbd18f88/1606528152187/rl_price_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/78613994061.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/gawokadaramosamowofaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce61f2dc-d78c-489b-aca6-8e8b1a69a22e/32392985459.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/keratina_sin_formol_en_el_embarazo.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/file_crack_photoshop_cc_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/22300117559.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_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 6176 bytes
SHA-256: 78ac498a873243cd47011a8dc809c9af63f5799b572903e892ff7db361423fbd
font_01_sfnt_off0000fb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0F 10984 bytes
SHA-256: e24ef3ee27bd00b4377c1ccc8964843ae00a6d636c3d9ded88619591bb780d5e

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