Malicious PDF — malware analysis report

Static analysis result for SHA-256 73391004eef37cec…

MALICIOUS

PDF

44.9 KB Created: 2020-10-07 22:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 64c7220b033fa8d86dc36542d28c2173 SHA-1: 735f31d788ca57d5873ec2bcafe86c67d1fb2a44 SHA-256: 73391004eef37cec2278b7ee5203cdd688e5cb34755d154f78559c7a44488c45
192 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body also contains a direct link to a suspicious URL, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?keyword=realidades+3+capitulo+3+practice+workbook+answers In PDF document text
    • http://files.boneup.beer/uploads/1/3/0/8/130873983/sidema.pdfIn PDF document text
    • http://files.mansfielddrivingacademy.com/uploads/1/3/1/4/131453674/jagobosegaw_vinaka_lemogulop.pdfIn PDF document text
    • http://files.personalcheftony.com/uploads/1/3/0/7/130739621/piraxu.pdfIn PDF document text
    • http://mumiru.interactivecapitalgroup.com/uploads/1/3/1/3/131383599/ccc5157e.pdfIn PDF document text
    • https://site-1036828.mozfiles.com/files/1036828/lepaxamusunal.pdfIn PDF document text
    • https://site-1039795.mozfiles.com/files/1039795/10044990871.pdfIn PDF document text
    • http://jemavusi.desiraeogden.com/uploads/1/3/1/3/131379538/loxozato_muwiduregelese_bavaxu.pdfIn PDF document text
    • http://files.hoppymeadowsrabbitry.com/uploads/1/3/1/6/131636727/9382784d42ad479.pdfIn PDF document text
    • http://pojofugaw.serialrunner.com/uploads/1/3/0/8/130813651/a2a3b47c72cf3f.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/392a3e8c-f145-4c0f-964c-5673bebf6daf/paziditawogafevurevamasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dcac24f-1dda-44ac-8375-3e98ad579019/buzedepal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cdd6e0d-af50-429b-b7de-b7adb4181502/jopogukewirefazebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d542a0ea-f7e5-4596-817a-d038ba4b9efa/42186898629.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_off00006f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F35 5532 bytes
SHA-256: 1c3b0c98179670f4ee570a3ccef72ef2a409ed80f3809786a98228d5e3b428ee
font_01_sfnt_off00008225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8225 10744 bytes
SHA-256: 724a466750160e9930e49d20d98bb78c441a2fc72dc2fdfac4d3ffa22aee620e

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