Malicious PDF — malware analysis report

Static analysis result for SHA-256 656bc314316f7268…

MALICIOUS

PDF

66.7 KB Created: 2020-11-11 02:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: beab08fdfabc55f133ad3f9a9ce5890c SHA-1: 62a30378a532200fb5080e5a7330c30921b1c5fd SHA-256: 656bc314316f72680a69bc4a6469a034242ae2516be9a0287d25272e67bcbb49
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 significant number of external links, identified as a link farm, which is a common tactic for SEO manipulation or directing users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/aws?keyword=lucas+bore+guide+sale PDF link annotation
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/vewofobalogutodo.pdfIn PDF document text
    • https://defusisiz.weebly.com/uploads/1/3/4/5/134599350/xupovasunazita.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/senunobit_zadajilavidugi_gogolomepugi_filaramejowebuz.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/0721a446-b17f-402d-af56-4a1a428734ce/renal_pyramids_echogenic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70da06b3-135a-4cca-8b33-06e14772c54f/76648648543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/364b03a6-5960-4da3-bd19-5a99522c4fff/renuripexowikupasabazotiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f07f435d-ad5e-495e-96c6-ee15fb88fd99/saturn_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/earth_science_packet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37d7c51e-e23f-4e82-9b6a-f4209cecfa99/98677386949.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/dizowulifi.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/maxumivez.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/historically_informed_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dfa325f-223f-43f3-a5e6-d5437577632d/65588324549.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/witodipijuduni.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_off0000c6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CC 5188 bytes
SHA-256: 4e67d9fb1bb8e415a466a2c9acb65a43d8c0b753f43ec68eeb68388b1db8b63b
font_01_sfnt_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 11116 bytes
SHA-256: e5b9259ecbeaf84c85dc111c37c2a5885439ac685970a0739c6380ba3375c12c

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