Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcb0ea5d6109598…

MALICIOUS

PDF

66.0 KB Created: 2020-11-12 14:23:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b9ec103e20a1b3464552297bf555f8c7 SHA-1: 1db2b8ef9d4bb745de3ea3c4c251d3c23d9a5988 SHA-256: fdcb0ea5d61095980783cdf7107285eb003405efbc91ee67723701dbee7c14f8
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains a large number of external links, suggesting it's part of a link farm or phishing campaign. The presence of an embedded URL and the 'Urgency / deadline lure' heuristic further support this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffking.ru/aws?utm_term=cholesterol+guidelines+2019+secondary+prevention PDF link annotation
    • https://sunawakajisume.weebly.com/uploads/1/3/4/3/134324988/xomozuworir_zisitukatab_dabiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374980/normal_5f97b4a1300f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381762/normal_5f9579781da37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375351/normal_5f98876fd8a52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f8ae856b3310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_5f8bb9fed8930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_5f8b997c97be9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_5faa01212301f.pdfIn PDF document text
    • https://vomilanusasapik.weebly.com/uploads/1/3/4/4/134478463/visukiwosafuvusudux.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/dorobukasawituw/67013612828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/086a6cf6-90d4-4cc6-9e10-8a8a9367cfe5/73766352248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05270fc6-8907-48df-be59-23b65fa0b8e2/53244861099.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_off0000c5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BB 5884 bytes
SHA-256: 33527a217aa43a8e7cacd88ef6495e46815fcb1a4dd401864708d04ac79c7348
font_01_sfnt_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 9876 bytes
SHA-256: 94fe7fe3b376aeb0535363bbe5b59742684123a41f91d6fdaf6d22d3e541efb9

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