Malicious PDF — malware analysis report

Static analysis result for SHA-256 f673702641308775…

MALICIOUS

PDF

77.8 KB Created: 2021-06-11 01:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0e5752351ecc4560290c712e8f3131eb SHA-1: e3b96edc226b392f43ceee6404c18c5c0863034c SHA-256: f6737026413087757f543781950c2b3dc79daf3b60f3c97b848c1871cca214d2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crysiq.ru/pbw?utm_term=download+subtitle+indonesia+fast+and+furious+6 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421477/normal_605ef65a514d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485010/normal_6036e2b46c42d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374852/normal_6006fb238ef78.pdfIn PDF document text
    • https://bowukobi.weebly.com/uploads/1/3/4/7/134706413/ketibobojobezofezax.pdfIn PDF document text
    • https://kujivorel.weebly.com/uploads/1/3/0/7/130776875/303469.pdfIn PDF document text
    • https://fosizujofaz.weebly.com/uploads/1/3/4/3/134315976/ce7f393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490138/normal_604cdfc22c4a2.pdfIn PDF document text
    • https://rufilepevaga.weebly.com/uploads/1/3/4/4/134444742/97ac88e2fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384316/normal_602664024a71d.pdfIn PDF document text
    • https://rejezulibege.weebly.com/uploads/1/3/4/0/134018585/xironivofosisif_jokew_bifosozokuxeli.pdfIn PDF document text
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/e504bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475987/normal_600403c5df952.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416140/normal_6005c0be3414d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378827/normal_601e2d47ba392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_60c28d2a897a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/def50b2f-1912-4cb9-8cd4-89a3723c798d/27241670283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eabbab2d-34fc-467e-bb07-fab76001b8e1/83479023779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1627fcd-46cc-4ec5-b97d-ed665785305b/bifatonagalikuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf50c965-9544-41d0-977d-e4f7ea3ccc22/jidezatapufal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb2bb82b-440d-4c90-ab42-dbe81be50022/53016677302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b2316d-e4b6-44ad-aa3f-ab7a60b55823/87765313408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be78007-8dbd-4bd5-8c81-814773bc3bcf/50651490666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f26361-7e0a-4c85-9f20-a383e063108c/daromulikagakijejas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b4548cb-4299-4c85-a456-ecf3ce77df64/susolezumemi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F1 5168 bytes
SHA-256: e0dcfa88e6fa5670110d1c2005bd09818a48885cda064899b6b5f03265d37289
font_01_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 12152 bytes
SHA-256: 7d4664a1752687ce52d0cfc4adfa2acaf3712ab1755ae3caf3379aceb94fe09f
font_02_sfnt_off00011b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B06 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333