Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2400d3e6afee5bd…

MALICIOUS

PDF

72.3 KB Created: 2021-04-06 15:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f7e54ae6f01dd8b010c9ff60dc4dbfa6 SHA-1: 546dfe3ecec82783ee5e68c185417bc4be7608bf SHA-256: c2400d3e6afee5bdef8d635a0a40f23617cdbb175ce47990adc8e23a3a38b32d
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector infrastructure, disguised as a user guide. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL is the primary indicator of compromise, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://crophysi.ru/wix?keyword=amazon+echo+show+5+user+guide+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4471235/normal_6039d155031f7.pdfIn PDF document text
    • http://derixen.22web.org/113906953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_603b6c9b1502e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_5fe786761db17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c625c63c-a381-4e1d-b1c7-b2549491808f/25483691148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1fe26a-2893-4385-b17f-114199f36ed1/jikerurerejibegegurekabuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ca12a8-0ebc-433e-9785-71e7aaf3185c/bulisiwisofekeget.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/nubazuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc16d90-3b31-4c1a-a97b-3eb505444bf5/where_can_i_find_the_book_of_enoch.pdfIn PDF document text
    • http://gigidubuvo.epizy.com/what_is_the_land_of_stories_book_3_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1416e766-36ed-498c-8fac-e6d01d3ace24/23374015460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/010d37b0-6267-4c13-9ff9-d651217c74d6/sodowalabobivokuk.pdfIn PDF document text
    • http://luxaneguwes.rf.gd/jezezudekitelorim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f5a780f-b3c7-4ad9-a447-19cc2e58ccc6/lasawoliwar.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_off0000d9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 5792 bytes
SHA-256: e7a209374de3228e47e123da0eb16ef9fba77374244cb1b5570dca2833764ec8
font_01_sfnt_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 11368 bytes
SHA-256: e257f7d1c1d0f9192dc88954ec36fb8a04cc302e322cbb0906533b55bed8a16d

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