Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca27fd625c1735e5…

MALICIOUS

PDF

66.9 KB Created: 2020-12-18 20:33:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5ebc70e4934c7033f70f35332e8da8c0 SHA-1: 087bcb0b44900af2f4999b08991ba757b2bbbdf3 SHA-256: ca27fd625c1735e5ccf3651d099f09584cebd03620c572459a2eeec7bb7301fc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, including suspicious ones hosted on weebly.com and trafffe.ru. The document's structure and embedded links suggest it is designed to manipulate search engine results or redirect users to potentially harmful content, aligning with phishing or SEO spam tactics.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/strik?utm_term=altan+arslan+bielefeld PDF link annotation
    • https://kufesolujuxubi.weebly.com/uploads/1/3/4/3/134373324/ruruxag_limokobapuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5f98a8982f6b8.pdfIn PDF document text
    • https://poroxokinawutaj.weebly.com/uploads/1/3/4/5/134507376/ribiguziso.pdfIn PDF document text
    • https://sodapovi.weebly.com/uploads/1/3/4/4/134494820/9960318.pdfIn PDF document text
    • https://mefinijusigoti.weebly.com/uploads/1/3/4/4/134499215/31accb6a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500889/normal_5fc8975e56864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_5fbf2ad3a2bf0.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/3057652.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/fd43eef71.pdfIn PDF document text
    • https://refamulu.weebly.com/uploads/1/3/4/8/134886446/2056673.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/5deec80f-b8ee-474c-be9d-2daad13a574e/dht_blocking_shampoo_for_men.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcecc0e4f0831169e741321/t/5fd654c23ebe0416315dbd1a/1607881922597/tefixubole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd104149-ee8f-4e87-a0ee-7f0722d41ae0/dewekarukelibepafate.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_off0000c680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC680 5028 bytes
SHA-256: 7bf16795616725acb3f11257c745e735079110e7d7ca4d8d1f3d69aec4b6e051
font_01_sfnt_off0000d7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A4 11932 bytes
SHA-256: 189e86fa54ec595490a59fb9028ad18d27f1dd4b7898eaccf49ac9bb32b04b63

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