Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc17db5b5179e18…

MALICIOUS

PDF

42.5 KB Created: 2020-10-11 14:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2146070fa574f18214ab1145ec9012fc SHA-1: 56ec8536cd8ac473a947aa098cbf314c4d463594 SHA-256: 5bc17db5b5179e18ff72d63608906421fc6dc6b80727853dd7847aa80acd1214
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm hosted on disposable domains, suggesting an attempt to distribute malware or phishing content. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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://cctraff.ru/strik?keyword=crock-pot+express+pressure+cooker+csc051+manual In PDF document text
    • http://gevoz.course.amsterdam/uploads/1/3/0/7/130740356/sidapiviv_mibukidilawubu_mosef.pdfIn PDF document text
    • http://kijan.jacksoncieslak.com/uploads/1/3/0/7/130739038/34cd53b95.pdfIn PDF document text
    • http://files.nicktillia.com/uploads/1/3/0/8/130874104/sazititagavef-lupisaniram.pdfIn PDF document text
    • http://lenop.2dovesdesignz.com/uploads/1/3/1/8/131857334/jirogiza.pdfIn PDF document text
    • http://xuxoniwef.mrpeebs.com/uploads/1/3/2/8/132815367/03f368d8.pdfIn PDF document text
    • https://site-1036988.mozfiles.com/files/1036988/tijujixemavazusizonaten.pdfIn PDF document text
    • https://site-1037890.mozfiles.com/files/1037890/46540637585.pdfIn PDF document text
    • https://site-1036820.mozfiles.com/files/1036820/65062715821.pdfIn PDF document text
    • https://site-1039553.mozfiles.com/files/1039553/pamupobitinakele.pdfIn PDF document text
    • https://site-1040879.mozfiles.com/files/1040879/55030504215.pdfIn PDF document text
    • https://site-1043126.mozfiles.com/files/1043126/razonebiruzuka.pdfIn PDF document text
    • https://site-1040094.mozfiles.com/files/1040094/41471518325.pdfIn PDF document text
    • https://site-1038995.mozfiles.com/files/1038995/poxatuserubelepufoxaf.pdfIn PDF document text
    • https://site-1043475.mozfiles.com/files/1043475/44081184765.pdfIn PDF document text
    • https://site-1036744.mozfiles.com/files/1036744/58933975066.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/9f16f04c-33f7-4a7d-993c-edfbfd365ea5/73666607067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab6bad4e-fc89-4594-8e6a-19853290506b/74945636881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b9e0648-abe4-4fbd-9b98-fe8894789c78/74964119658.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_off000065ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65BA 5468 bytes
SHA-256: 9acb6eaf445ca25b6dc2dc6677227bbb18ab3f655bb515f10df11326a2eb0df8
font_01_sfnt_off0000784d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x784D 10716 bytes
SHA-256: 568c3ff97984b27a1a40ac1e5dbfc49ae1d078d019759de9c3b0df910da58cbe

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