Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ba63ce29a0be07…

MALICIOUS

PDF

66.6 KB Created: 2021-01-07 21:10:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7ad72142e73f687a854ef417b356182e SHA-1: c6a810d5e3c659bbe4bf70371f17d3c74ae9d75b SHA-256: 95ba63ce29a0be076a293bbd649b94de101d953e746be15ffceaa52e6ab10ca8
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure at 'https://cctraff.ru/123?utm_term=algebra+6th+grade+ppt'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a tactic to distribute malicious content or engage in SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

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://cctraff.ru/123?utm_term=algebra+6th+grade+ppt In PDF document text
    • https://vuzufakafedovi.weebly.com/uploads/1/3/5/3/135347170/2900408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f962cda4e235.pdfIn PDF document text
    • https://cdn.sqhk.co/xakutofi/jbYjc97/virus_definition_computer_security.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501042/normal_5fbf21cc32b16.pdfIn PDF document text
    • https://gabinomila.weebly.com/uploads/1/3/4/7/134763369/80504dcdfe.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/hFhfhcj/penguin_isle_cheats_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452595/normal_5feeb5fa389bb.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/ae238e1e-730f-476a-803b-72d553ddcd2a/kogama_mundo_gigante.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46edb017-a03a-4c13-a8f3-5bb7f5bc4bb1/39563248022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7657cc5c-7285-4ad5-9f34-a34938ecd445/skyrim_se_sexlab_mods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aceb8ba-9a00-4ad3-a3c9-b2d16b7b62bb/amazing_grace_house_of_the_rising_sun_lead_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25ed48a-ffdd-4798-80f2-7f10599f4d49/66184556021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d0976c-a1a7-4346-a93b-55ca6ab56228/who_invented_sewing_machine_first.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aacf96e3-3821-490e-bf53-9e1abafdb96b/28293754323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2093dd37-7674-46ab-8e22-3e0fa07739e4/71643518571.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_off0000c74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74D 5324 bytes
SHA-256: 1bef57e2557675eb3173c719f54fd061e7c01539cbf19faa748c2a97a8e4c8fe
font_01_sfnt_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 10656 bytes
SHA-256: d1660f1b7d1eed347343c0410a6b04a4cfaf25e39046a6c3651cd20bbaa4c334

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