Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03783af65dce291…

MALICIOUS

PDF

44.2 KB Created: 2020-10-11 18:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 353157b966e8d7c3195f731a1f0b5952 SHA-1: 8b76e4fc6e606e953ce6477c714cb9cc276aaead SHA-256: e03783af65dce29158f6850d0e5329dbd05e945d4877d9402a67cc07da66a4bb
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to external PDF files hosted on disposable domains, indicating a link farm or SEO manipulation scheme. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, potentially for further payload delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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/strik?keyword=%25C3%25A9valuation+ce2+les+grandes+p%25C3%25A9riodes+de+l%2527histoire In PDF document text
    • https://site-1043796.mozfiles.com/files/1043796/bogawajenewu.pdfIn PDF document text
    • https://site-1037875.mozfiles.com/files/1037875/39459973564.pdfIn PDF document text
    • https://site-1043098.mozfiles.com/files/1043098/13079031727.pdfIn PDF document text
    • https://site-1041207.mozfiles.com/files/1041207/2623349915.pdfIn PDF document text
    • https://site-1038919.mozfiles.com/files/1038919/48358594383.pdfIn PDF document text
    • https://site-1042822.mozfiles.com/files/1042822/vojumedalog.pdfIn PDF document text
    • http://files.norwoodschoolstore.com/uploads/1/3/1/0/131070602/tapumujinaru.pdfIn PDF document text
    • http://files.redneckfest.org/uploads/1/3/0/7/130739088/2225779.pdfIn PDF document text
    • http://files.ncnats.org/uploads/1/3/1/8/131856134/vedifovobe.pdfIn PDF document text
    • http://niguwuka.sparkfoundation.ca/uploads/1/3/0/9/130969724/1975415.pdfIn PDF document text
    • http://files.sunburstmt.org/uploads/1/3/0/7/130776591/34afc8.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/04324e9b-5e33-46a0-8cfc-5a3e403a3512/zotulopipowamaxuwaderaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9cdb515-f994-4508-ae25-09422df52bbd/86746082778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/359f18ef-6510-4fba-b7dc-efd6ac1b6ebd/topofaxevab.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_off00006964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6964 5680 bytes
SHA-256: 99f4627f142b52c6a09b8d9f986b5db6614714aab01770d8407e4f74a88a6a0b
font_01_sfnt_off00007c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7D 11576 bytes
SHA-256: 09ccab15193a0fad0f157206bb13a9fa07e459ffa119c6232c15d5b7686d8e01

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