Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42c078e3aba980e…

MALICIOUS

PDF

68.9 KB Created: 2020-12-05 11:00:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 714ab70f28228b4bafbf22a12117f125 SHA-1: 1686e96a7e0183cb88c1e20d2be5ddfbfc86f7f1 SHA-256: d42c078e3aba980e739fcd42cf52bbe89a2285fa1d687ca4c9939ec72cf1d86b
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to other PDFs, indicating a link farm or SEO spamming technique. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=special+senses+lab+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477376/normal_5fc20dbf15ebb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409118/normal_5f99460e205e4.pdfIn PDF document text
    • https://bovozamebezunun.weebly.com/uploads/1/3/4/7/134701649/detedisoxuwetik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384316/normal_5fc7463fb4bdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415745/normal_5fbee817a2263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444884/normal_5fa84040d76ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388839/normal_5f8e97346c6ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f87224dd3819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5fa1bb556e923.pdfIn PDF document text
    • https://kedifekutijita.weebly.com/uploads/1/3/4/7/134713117/dugogofig.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/9888dc58-9c49-498c-8a19-fec81463cf69/minimized_cardiopulmonary_bypass_tec.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/47094422386.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/c_a_d_g_e_informal.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_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 5264 bytes
SHA-256: 9caed81ab2d110fd8df97319bfd85cf624387b49875393c6f20d13613723cdf4
font_01_sfnt_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 10424 bytes
SHA-256: 36ccf8c5ec402621853ee449f6a60d63db79e992005ec9d0d94e195c241d3705

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