Malicious PDF — malware analysis report

Static analysis result for SHA-256 534558136f58f6e3…

MALICIOUS

PDF

72.3 KB Created: 2020-11-09 18:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 082ae0f9577a679b11ca25edd5bfbf0a SHA-1: 2f1bbdf4ec13c90eb4ab21a5c99f9faf2230d41d SHA-256: 534558136f58f6e3519b0048eb02587de5602d5dba9ac7e43056dc7665f5bbaa
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or SEO spam operation. The heuristic PDF_SEO_LINK_FARM and the ClamAV detection as Pdf.Phishing.Trojan indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest a phishing or malicious redirection attempt.

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://trafftec.ru/aws?keyword=google+search+education+lessons PDF link annotation
    • https://togurekeve.weebly.com/uploads/1/3/4/0/134040335/9443833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388827/normal_5f985fd7c1ced.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/0f5da78a5f130b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_5f9a519def1f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f9c77bb0d228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403687/normal_5f97620c34fbb.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/7c0cbcf3-02a7-4223-99a5-94538060c77c/31229889640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/567746dd-e99c-404f-b8a4-e0a122e5bcd1/wajimujetedoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6eebf61-54cb-407f-9992-a5af2219359b/11924420452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f7e4ae-fb5d-4784-b679-f4604ff48356/anatomy_and_physiology_2_case_studies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b15f801-0ee1-417b-8009-52780ca55912/bed_wars_map.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/xifudotosemidonotaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a8574a2-9b6b-420e-8b70-c38add31094f/guia_bloodborne_ps4.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_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 5232 bytes
SHA-256: a0155f97e32579aa2882ff7f9481b0a6c5336ed52487e8ab3c337d9033b9b7bb
font_01_sfnt_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 10636 bytes
SHA-256: a34fda2cc0ae62835535160743100120f1645b641a4f9bfc8f3b98a9a4b0e492

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