Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f79577bd9b5729…

MALICIOUS

PDF

55.7 KB Created: 2020-12-19 22:08:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5e17d5db3ca7e8a270b18ce64d1784d9 SHA-1: ec3e135e29171e506d8c3185948afcbdc746685e SHA-256: 16f79577bd9b57290cab483f0488e35f2949edfee2d4fd046af6a33f6539e706
214 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to what appears to be a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead users to harmful sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://ggtraff.ru/123?utm_term=hunter+college+school+of+education+graduate+admissions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5f87b7dd3f17b.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/861b5aa5.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/b0a89b31-799c-4dfe-a142-99ce8a7be567/baixar_filme_o_poder_do_ritmo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2166e582-d370-4aad-8e8c-191492596641/decdete_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b57c4fe4-774a-4c4f-bef7-08ec358fbee9/92867045300.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/52363935795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75496b7c-4f8e-47e1-85bd-6c6cdecf89be/rofaxawutiwef.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5b873c02f22b9d049b04/1606376328104/something_blue_movie_where_to_watch.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_off0000a25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA25F 5396 bytes
SHA-256: 52c9ea44fb2e880b7b8e5f3271e248bda9b7efa796c8f7cc5cc57f07921cc3fa
font_01_sfnt_off0000b48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48B 8740 bytes
SHA-256: d714a95132328ae7880e61bd374cfa99496a26f39d964f5ae1fa4331239145c8

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