Malicious PDF — malware analysis report

Static analysis result for SHA-256 f030640fd7671338…

MALICIOUS

PDF

72.6 KB Created: 2021-01-06 05:23:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e465fab292f9e6659d9e67676a8c8bd3 SHA-1: 996fc68f18120a1dbba5931fc64214fc722724e4 SHA-256: f030640fd7671338e975d60373c7142b4975fbb8605417a2541bad152b942537
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many pointing to other PDFs, which is indicative of a link farm or SEO spamming operation. The presence of a link to known malicious redirector infrastructure further supports a malicious intent. While no scripts were extracted, the overall structure and URL distribution suggest a phishing or spamming campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/wb?keyword=best%20motogp%20racers%20of%20all%20time In PDF document text
    • https://rusokupos.weebly.com/uploads/1/3/4/4/134468665/dugupajobasuki_fopejijiz_bitobovibopelo.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/zjcx6gc/classic_rock_pop_radio_stations.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/M6GKghH/testicle_drop_puppy.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/Xiggdcj/tudebikufosigemadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387581/normal_5fbdf39c24fba.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/jaibYjc/loop_diuretic_conversion_iv_to_po.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472475/normal_5fb7d614874c6.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/fdda8732-83aa-49ea-b54e-cf6acb37838e/7513882665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4236bd53-8f09-41bf-a379-76b75dbd4566/error_code_5003_hulu_on_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e99a088-c565-4776-813a-8d45db784b4a/titan_ion_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0eb8361-bccd-4b7d-9294-9eea5be769a2/46378340114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac5df9d5-8c7c-4d31-b887-c5df2e297bde/singing_in_the_rain_cast_and_crew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6086f792-5335-4411-bc17-e623dc84a2be/gujafele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44bc5008-a158-4bf1-ad88-8b6ae1602808/vuzuragiwuwifunazuwekom.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_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 5384 bytes
SHA-256: ceeca504f64b056983b61bc9e140611787ab0537f04673cdc239239fa7bd3194
font_01_sfnt_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 10328 bytes
SHA-256: 99a3fe1f4008213b55ea9b63d20e3d7e879e971b3581df6d26c7d66714d7231d

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