Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e90679bae0002f9…

MALICIOUS

PDF

74.6 KB Created: 2020-11-28 21:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8af00584457e5907938bc1bfaeb31889 SHA-1: 9858754d1d8a043a34806b49866f4595bf1e437b SHA-256: 4e90679bae0002f9dfb7f3d8cf3d41c630b421af9991b130e9726d9b3c5eca7c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external PDF files, suggesting a link farm for SEO manipulation or phishing. One critical heuristic firing indicates a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/aws?utm_term=determiners+worksheets+for+class+7 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5fa96b3c1c3a4.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/4fcf7b50e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386822/normal_5fc244fd83f25.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://s3.amazonaws.com/setikizo/conversion_customary_units_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/james_and_the_giant_peach_online.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/ottoman_empire_full_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b79528c0-b790-4084-b7a3-3ab4f02ceaa7/disturbed_sleep_pattern_related_to_pain_nursing_care_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/99221084153.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/hack_clash_royale_apk_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ddabf3a-3c93-4435-83cb-1e84a5987de6/infinite_campus_waukesha_parent_portal.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B7 5144 bytes
SHA-256: 27e5de8c3d6c16bd165977fed36d33d3d0e956892153b68051b04722165ab7b2
font_01_sfnt_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 2032 bytes
SHA-256: 7cd63ea236a3a6d34ee5cfcf5f2ed40bd3c4c6d914ea15b4ac01f3e62163efdc
font_02_sfnt_off0000eba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA4 10516 bytes
SHA-256: 42eb64fb6cde858c6e6645bca420111aa4c9d6f9d20117fe3f855a06916f9db3
font_03_sfnt_off00010f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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