Malicious PDF — malware analysis report

Static analysis result for SHA-256 8924358b77459cab…

MALICIOUS

PDF

79.2 KB Created: 2021-03-24 21:32:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d46613b6b7f7c7418657ed495c9e6ef6 SHA-1: 59e98445f6417da330d47e97accea5de0067566f SHA-256: 8924358b77459cab524c82d9128ae9a5488f76400eb5c73ced9e6a8d4bd1c493
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/123?utm_term=block+strike+mod+unlimited+money PDF link annotation
    • http://sakivometo.medianewsonline.com/bangla_bukhari_sharif_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374380/normal_60083ac4bd215.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/hLgWf38/mobile_passport_app_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465688/normal_6056133e048a4.pdfIn PDF document text
    • http://ritual-venki.online/kepinekejimeftxbm.pdfIn PDF document text
    • http://4gusevshop.website/quemacocos_manuales_monterreyfu6nv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446394/normal_60030b626a0eb.pdfIn PDF document text
    • https://cdn.sqhk.co/marezotije/heqHheR/mumol.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/where_to_buy_fleck_5600sxt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_60155ee19c4a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5fe7addfc7d10.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/wjfibhj/68939567926.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_634953d4a1f64bbabad5ffd0aabf8f3c.pdf?index=trueIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_2d135c35d37945558c02594c56311829.pdf?index=trueIn PDF document text
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_519eaa1f5e884804a5569db368a3d3d6.pdf?index=trueIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_29e5675f87694540b0a6d72e2d440ec8.pdf?index=trueIn PDF document text
    • http://zugagib.atwebpages.com/senanopugibokaligiberome.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_a6637820d3e94ad9922636d6483f250e.pdf?index=trueIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_1573cd04149c450facd685442e2ce2f3.pdf?index=trueIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_6775c182119b48e3b77d1f42b2e27d45.pdf?index=trueIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_d89bd2173a8241d6b2b8605541d60e9a.pdf?index=trueIn 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_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 5092 bytes
SHA-256: 1687b4c8ec6ff31ef7b6a06719697a4a0fe3b9dca7ddfcf477297abef8ca77b1
font_01_sfnt_off00010ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE1 10624 bytes
SHA-256: 2c5f9e81d945d412159cb355e71dde4b38545023b6f79802472551d41b348445