Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4db5c13648fb4eb…

MALICIOUS

PDF

74.2 KB Created: 2020-12-26 19:34:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bc274511dff5ebb967b57d0afe91aec5 SHA-1: ed275bfa8fe0abdbf0a1a187390ba9884f4ff689 SHA-256: d4db5c13648fb4eb43170ec50287ef032fbb759bd12b06a0e6d0e337a7cfafdc
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, with at least one identified as a malicious redirector. The document body, though partially obfuscated, appears to contain search query text, suggesting a lure to trick users into clicking on these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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=what+does+supercalifragilisticexpialidocious+mean+in+the+dictionary In PDF document text
    • https://cdn.sqhk.co/masamiwe/XZ8khdn/17895055193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486215/normal_5fa935da8e91f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_5fb8aa4e30792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462681/normal_5fb00b06104d4.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/gcuidhb/sky_surfing_aviation_florida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_5fd335e594db9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492575/normal_5fc5561d72d32.pdfIn PDF document text
    • https://lopufofogepuxal.weebly.com/uploads/1/3/4/6/134695200/d627a273694.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/ganubifirigevi/1st_2nd_3rd_person_pronouns_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c55d95-57bf-494e-9736-86fc44b4efe0/living_environment_regents_answer_key_january_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/business_model_generation_a_handbook_for_visionaries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a5da89-0c20-4862-acdb-3ce98ec25ac4/61119825053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e65d2c13-2914-4979-8251-ffbd7aa8dfda/the_wolf_of_wall_street_torrent_down.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_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 5752 bytes
SHA-256: a5e9c1c4ab2e22cc4857c4427be060cef58d5341f7d747f6431706473e0e09f4
font_01_sfnt_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 12004 bytes
SHA-256: 4ee4cf0110a8922f68d6023cfee9b9fc4753b812ad40a39fba108dcb7a0aa137

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