Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3dbc9a6e769f2fa…

MALICIOUS

PDF

69.9 KB Created: 2020-12-15 22:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5a8ee128936ae85db168255a85080e78 SHA-1: 129255017460b4393d2d381c3074d3be98a7eb74 SHA-256: b3dbc9a6e769f2fa2963ff353bfc027f8f8e329cb1ac2d33394468d30a9cccb0
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate this is a malicious redirector and part of a link farm, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://gettraff.ru/123?utm_term=etrade+solo+401k In PDF document text
    • https://tufutitos.weebly.com/uploads/1/3/4/4/134491926/26d2f9c6d80.pdfIn PDF document text
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/4744397.pdfIn PDF document text
    • https://tetikofigutuda.weebly.com/uploads/1/3/4/4/134445118/ladel-karorobataz-dapoku-motagebubamod.pdfIn PDF document text
    • https://baxakazakibabim.weebly.com/uploads/1/3/4/5/134585713/nedeke.pdfIn PDF document text
    • https://kaxojolomo.weebly.com/uploads/1/3/4/8/134885197/c6f5842.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459188/normal_5faf6ed144321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450152/normal_5fa369e442e8f.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://uploads.strikinglycdn.com/files/6ec7600b-a215-4110-bf74-351836a0e078/discovering_statistics_using_r_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/the_history_of_whoo_lipstick.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/1873188535.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/50512140973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd857bab-56fe-4bd2-9f7c-20c02efdb500/a_concise_guide_to_macroeconomics_pd.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/gexigasamumalunaropim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC990 4756 bytes
SHA-256: 32ded62ab717a5f0b657056373f373e3c94524df17f5523ffe126a99fb18d57e
font_01_sfnt_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 10252 bytes
SHA-256: 1425db67a2ff84b4dc89b4b2033429c7dc23b6e8202d5912ce229c71b11296b1
font_02_sfnt_off0000fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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