Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55d1983a7f7b445…

MALICIOUS

PDF

76.2 KB Created: 2020-12-25 18:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7bbf04bb79a23b803d7c48c4dbe129fd SHA-1: b91c8830ad2108d3ccc69ea4ee9a5f6dd9866447 SHA-256: f55d1983a7f7b445d9ae09379b3aecda5d85b3899b61a77e891249936cb0c222
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or a method to distribute further malicious content. The primary malicious URL identified is trafffe.ru, which is likely used to redirect users to a phishing or malware download page. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://trafffe.ru/strik?utm_term=clash+of+clans+crown+base+th9 PDF link annotation
    • https://vafeperaj.weebly.com/uploads/1/3/4/5/134586379/xevosafubadarofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450046/normal_5fd15d0cd407f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_5fae496c64bed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476272/normal_5fdf2af58c699.pdfIn PDF document text
    • https://kaposabebozof.weebly.com/uploads/1/3/4/4/134466843/8708b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_5f9ef6a9aac6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460457/normal_5fb77a484b57f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403805/normal_5fe161e32694a.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/08662a0f-07ae-4991-86c5-1c33038e9d1b/61151130531.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/73857840405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d6b8fc-3fb2-4d44-880a-c1901991e557/bushcraft_mors_kochanski.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/24658431482.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/25577828078.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/dishonored_knife_of_dunwall_guide.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010c3d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10C3D 16228 bytes
SHA-256: 0ee31ef84b84bd75545334dc5c0e8e1058cafdf8194f44f5507053bb680d16e0
font_00_sfnt_off0000c994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC994 2960 bytes
SHA-256: 4b49b5f6bece70db7ec74646561081c3b544f0269218c51928ca17b2cf811e90
font_01_sfnt_off0000d421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 5260 bytes
SHA-256: fcdbabbf85f1beb36fde3deee7df72deb35cc243c12253673afa02a2d8156cc1
font_02_sfnt_off0000e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 11120 bytes
SHA-256: 1074deffc32fdb78aad866e883108204e09d848b24316553b611461f61950105

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