Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff1fff714f2f6fc…

MALICIOUS

PDF

66.0 KB Created: 2020-12-23 19:25:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0409b4480416675a693a06777c255991 SHA-1: 7cfea9580a9382166c89f0c11c8430c4eb9147a4 SHA-256: 6ff1fff714f2f6fc04726a42a954688ed77fdf337788f40f567120fc866cbaf5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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.
  • 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://traffnew.ru/123?utm_term=spongebob+text+generator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f86f5d59d3e4.pdfIn PDF document text
    • https://kikokowenut.weebly.com/uploads/1/3/4/7/134713101/3167821.pdfIn PDF document text
    • https://mimoberojatef.weebly.com/uploads/1/3/4/3/134316463/ae7bda8c311.pdfIn PDF document text
    • https://gipegilut.weebly.com/uploads/1/3/4/6/134699389/1029700.pdfIn PDF document text
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/nazigozubuvak-vunasej-kodaginegu-vibojifozonug.pdfIn PDF document text
    • https://liloxowilobo.weebly.com/uploads/1/3/4/2/134265539/a6d00608c.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/705cc801.pdfIn PDF document text
    • https://pojirada.weebly.com/uploads/1/3/2/7/132741169/1024470.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/4f564f.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/kakegibefokow.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/7f712e24-e5ec-473b-bb35-a43e03e613cf/62919437958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bad39b0a-b22d-4c17-bb8c-7f4bf15bd7bc/other_evidence_for_evolution_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89019bfc-20d3-4c44-8080-57b0731a950d/73884206591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/953059cd-4508-42b5-ab62-faa15021a5ef/74239233287.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_off0000c3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F5 5088 bytes
SHA-256: 074038ca58f52e26b87fd42910b9c20a36e1639c30af9c8689d0efd9082cb453
font_01_sfnt_off0000d558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 11288 bytes
SHA-256: a9977397e2f859effc30ac58b47302f6e77b3907dac55d1ef068a5b5dd4c105d

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