Malicious PDF — malware analysis report

Static analysis result for SHA-256 4900b769c8d1427c…

MALICIOUS

PDF

71.4 KB Created: 2021-01-22 15:17:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 4c5860e230c87ea035c0b77406cb86a7 SHA-1: 197d062ee896428023e52e261459a7d71e6c9b43 SHA-256: 4900b769c8d1427cf420648e487f9b6d1606e7d4531b982cc15506d8385ae2c5
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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://yafferge.ru/wb?keyword=overdrive%20premium%20mod%20apk%20android%201 In PDF document text
    • http://xaduwojitodefo.66ghz.com/lapirijaxididudewakagasuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421944/normal_5fdf1c0199152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456705/normal_5fd8090bca2d9.pdfIn PDF document text
    • http://nibumuxadata.66ghz.com/punctuation_practice_worksheets_9th_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472486/normal_5fdc73a1e8800.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493891/normal_6007bf00b5833.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481422/normal_5ff07c20cb9c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365583/normal_5ff7cdcbed0a2.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/rujabepifar/new_cutting_edge_upper_intermediate_tests.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/vesemif.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/jefofo.pdfIn PDF document text
    • http://rubaporejolo.rf.gd/pomutezo.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/94898329434.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/45488690012.pdfIn PDF document text
    • http://davafegi.epizy.com/kadubunazuzebugas.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_off0000d25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25F 5100 bytes
SHA-256: 441d93ab5acaed0d0ab8f239b14eed1ea797be1f48a68998d12c880312f6ecde
font_01_sfnt_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 14148 bytes
SHA-256: 290141c39de435956df598e2bb906c799372d2dda314f0ccb9e521da067aa097