Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f848e0aaca61040…

MALICIOUS

PDF

65.4 KB Created: 2020-12-18 19:32:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 63985764c5dc135e6b80e1ec0eeaeeae SHA-1: 99ccfed9e6eaf53bad804b503373549b69ad6012 SHA-256: 5f848e0aaca61040e87d507891d8e9afe50582a61e5bf6f5fcb02c61f123f762
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic indicating it's an SEO redirector link for phishing, disguised as a free download. The primary malicious URL identified is https://trafficel.ru/strik?utm_term=special+relativity+pdf. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded link suggest an attempt to trick the user into visiting a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://trafficel.ru/strik?utm_term=special+relativity+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401518/normal_5fda6da64ac1b.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/godoremitiwuja/calcium_rich_fruits_and_vegetables_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aecff561-bc43-4e25-bde0-e1f1423e24ad/mumaxudagimabetad.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/78193632475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f016586-6e5d-4910-8dbd-8d59c72b8870/zalisixelonev.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/nidozubakigix.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/fezegazezoruvod.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/kindle_paperwhite_reading_formats.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/nozikomugim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42453848-6b37-454d-9045-5ea178ea1856/anand_srinivasan_books_in_tamil.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_off0000c4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B2 5236 bytes
SHA-256: 4acdef17b0d41e81d01027f8824c5d7f2ceb58bacd5ed3f2da9654dbab6807d9
font_01_sfnt_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 10060 bytes
SHA-256: fbaa49667614cb5b8e3ebd0f77ae00d56e10f83d42aaadfa9b387e7df0e82409

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