Malicious PDF — malware analysis report

Static analysis result for SHA-256 779f0f58a927b021…

MALICIOUS

PDF

84.5 KB Created: 2020-12-25 06:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 90628877125753538eaded50ee0844cd SHA-1: 9583406f280071a448631cec1e3bea1f5859b934 SHA-256: 779f0f58a927b02150fdac00d59770161b9ba3631f3604cc28762bf793cb5348
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' and another flagging it as a phishing/trojan. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the heuristic findings suggest the document is designed to redirect users to malicious sites, likely for downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/strik?utm_term=bubble+shooter+puzzle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471682/normal_5fc35f7634104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_5f92091b98ef7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_5f97e396193c6.pdfIn PDF document text
    • https://cdn.sqhk.co/sofaxuleruri/R67RUVt/ding_employee_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5f92ae6ad676c.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/vajatufo.pdfIn PDF document text
    • https://cdn.sqhk.co/berovanova/7v5hbfD/2020_wallpaper_hd_4k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454041/normal_5fcb6d9a4e299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f8ec22c453b2.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/fifuto/catalogo_esselunga_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a28986c4-e85f-4d71-8cd6-62b9aabd2b9c/gte_routing_number_tampa_fl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4956b383-9103-47d0-9545-82b7cdf4a612/vajinositipuvekaluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bea9644-e840-4633-abf7-1ff6fc03b31f/97489470132.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/94346161754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9573286d-052d-476a-8eb9-c69dd6ba0702/gibebinaninigejonarodatok.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 4936 bytes
SHA-256: cfc0ac839469a358464e576e223bebd8cecedb757c84adcacb6d91d021cafae5
font_01_sfnt_off0001087a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 11032 bytes
SHA-256: 94bdc871009c4d55e8e78b7aca18067ee97c439a87c6f2c3201bdee6e5fab186
font_02_sfnt_off00012e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E82 16416 bytes
SHA-256: 4bf7462e787791ee30cced4e4a0065977ba460b587ec5e4d0bf31a1282398818

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