Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e9ad781fce1566…

MALICIOUS

PDF

64.9 KB Created: 2020-12-01 14:02:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 015036a0a680c449f7af07471d1c1dcf SHA-1: 2bbd48daa42e94319c5590cc8d676b65fd87fb4a SHA-256: c2e9ad781fce15661366bfb31970df6eb3bc0c786a59bb36ceac17811609219f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO spam campaign. It contains a large number of external links, including a link farm, pointing to various PDF files hosted on external domains. The primary URL identified is trafffi.ru, suggesting a potential redirection or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=usdf+intro+test+a+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413703/normal_5fba1dd9d45e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f8726b828da3.pdfIn PDF document text
    • https://suzulazupe.weebly.com/uploads/1/3/3/9/133997697/283804.pdfIn PDF document text
    • https://wuwenivavubujer.weebly.com/uploads/1/3/1/4/131437756/8515.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/549397a5-4f28-4e81-80cf-5b0394a4cd38/munoninifejaziteroxul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b2d0e5-cd74-440b-8348-2b374499818d/.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/ereadingworksheets_figurative_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea12ffeb-bc36-4d26-8823-b313778c1841/afk_arena_hack_ipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83bc02c2-350d-41ed-9a75-6481c7cb0769/82713143400.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf542c4e98326c02076ab3/1606374444596/14076442750.pdfIn PDF document text
    • https://s3.amazonaws.com/vopadofugon/drift_hunter_hacked_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e58c10ab-a903-449e-88cd-a0146c5323f7/rudazafilov.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_off0000bece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECE 5132 bytes
SHA-256: a90a24202a6086f2f9a7cf48a635e008840d160b81cc5d3638ae28b7068179e5
font_01_sfnt_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 11496 bytes
SHA-256: 7e65cb3cf066cf549b42c1bd3f8c45e00f18b14b7370138ce8792c7c21bdebdc

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