Malicious PDF — malware analysis report

Static analysis result for SHA-256 de42a5bf1683f7c0…

MALICIOUS

PDF

69.1 KB Created: 2020-11-13 00:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d2cb7b94bb9f4a8873b87f247f777372 SHA-1: da0b26068fa64407ea6c508221c8388895e49ec1 SHA-256: de42a5bf1683f7c04e570d393429f1e15874794a83dbb10eedd6156add961aeb
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, and one primary URL that appears to be a redirector for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to free movie streaming, suggesting a lure to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffnew.ru/strik?utm_term=watch+star+wars+despecialized+edition+online+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412768/normal_5f963991a95af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f875040062d4.pdfIn PDF document text
    • https://zitavumerut.weebly.com/uploads/1/3/4/4/134465292/nujone.pdfIn PDF document text
    • https://zemuxarasojutin.weebly.com/uploads/1/3/4/3/134374283/ca60896.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/dudejelutoxoweterif.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/lixavej_rivutavipulox_vunezikavad_lirumonoguwako.pdfIn PDF document text
    • https://repenakexo.weebly.com/uploads/1/3/4/6/134600143/minozuzuruwabaz-xeput.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/garorowa/faviwamofufawebasamuzefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bca2591-da1f-45d6-8aaa-96f5878ecee9/meaning_of_bottom_up_processing.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/vibifabow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6525dd99-164a-4af1-95dc-6ad97b146a8d/kikor.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_off0000cee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE7 5396 bytes
SHA-256: 4f2c73b952b771551410ebec6bda374b5928a3d4a0a9e3f4a1e54dff64e628f8
font_01_sfnt_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 11040 bytes
SHA-256: 140de6de7c9725ea0defed13a184600cc810d75111b313d2638304079deed3b0

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