Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dde95116e7810da…

MALICIOUS

PDF

139.3 KB Created: 2021-06-11 09:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2271b7ff53130e7cb98569e6dd86ba7d SHA-1: 28c9dad875327170d7c29654acd3cbcdefbca4a0 SHA-256: 2dde95116e7810dac37d20def7c3b261823ff2e29b10ca92d8aa7b05855f1717
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. This is a common technique for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/pbw?utm_term=convert+ocr+pdf+to+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407304/normal_5fd65f27f2f61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366965/normal_5fe3d91f14bdb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459796/normal_6007c4928a0c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471710/normal_6012571fb39cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408879/normal_602cb1696d22c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387406/normal_60602918e7bd0.pdfIn PDF document text
    • https://dituwugo.weebly.com/uploads/1/3/4/2/134235792/f25717.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5feeb20340cf2.pdfIn PDF document text
    • https://rivewatot.weebly.com/uploads/1/3/3/9/133999312/pozonas.pdfIn PDF document text
    • https://lotuvimipel.weebly.com/uploads/1/3/0/7/130739731/c1e38eca3e9425a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378620/normal_6002dbf16bf93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408707/normal_5fc9f29ec7e1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479684/normal_60bf900494b02.pdfIn PDF document text
    • https://sitoluvumoroge.weebly.com/uploads/1/3/4/7/134762666/5501998.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4384296/normal_60b150157a102.pdfIn PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/acdff4d3f5e0.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/b906b368-50b8-4ec6-988d-13b56143bddb/mimukulonowad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7219870-1d11-42ee-ad2e-4437c9e985ac/60503447257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68556d8b-263a-4af9-ac53-94a8ccf8cc14/18578012941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b0350fa-2c30-4b11-bf63-21fde1405ecc/15613087681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94619297-342a-4fcc-bc96-2404c31b0c4a/homelite_330_chainsaw_chain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f647c2-45ef-4496-a00c-f2dede08b849/94185257598.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_off0001e5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5F4 4692 bytes
SHA-256: b8d33403c6fd7e36d1c15150069861a919f116292a58a60177dedf63f28dec5d
font_01_sfnt_off0001f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F605 12292 bytes
SHA-256: 2fc70dedc8defe305354d9a2b1d0685d44c817410591f916baaff19824f64572