Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8c6e4557ec8a5b…

MALICIOUS

PDF

78.1 KB Created: 2021-05-30 07:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 739cacde44bce64815d364a18359164d SHA-1: 20fb4dc445673ed5bc974efdc037db69faf5a318 SHA-256: 5f8c6e4557ec8a5be09cacf1570f36840733baf2cf2ab4b750a119d4fba105da
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, such as phishing or distributing further malware. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score suggest malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=how+to+exercise+while+carb+cycling PDF link annotation
    • https://lezogujivezubix.weebly.com/uploads/1/3/4/8/134878846/59444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458144/normal_6035cf341af3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478131/normal_60590c383534b.pdfIn PDF document text
    • https://polaposegit.weebly.com/uploads/1/3/4/5/134591324/jazup_zemabivozunirim_kimodugala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_5fdc5669b9c6f.pdfIn PDF document text
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/1576722.pdfIn PDF document text
    • https://kolojadulosa.weebly.com/uploads/1/3/1/3/131397946/926cc447.pdfIn PDF document text
    • https://gowewibejeji.weebly.com/uploads/1/3/4/4/134481286/733942.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5ffab4129aa23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_60270d5f5418a.pdfIn PDF document text
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/f62636c25aee1.pdfIn PDF document text
    • https://wekigenajelu.weebly.com/uploads/1/3/3/9/133999196/gipesatijemanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449789/normal_602068d4b9e2f.pdfIn PDF document text
    • https://bidiruvinevuf.weebly.com/uploads/1/3/1/3/131379477/felunit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407777/normal_601dc35b5dd46.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/0fcbfbd9-1419-434b-b798-c5e510b09c61/how_fast_is_a_dodge_charger_hellcat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c26ba4fd-316f-49b0-b7db-ccf398e7769e/cashier_customer_service_job_description_resume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25887a95-c62d-4325-908c-a8544fa7771b/2154018492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ffab5db-62f1-40a0-a005-e2dd1f4b47a0/diniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5252174d-ed52-4725-8067-73d38628f432/40784179353.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_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 5424 bytes
SHA-256: 32380d98dd6b2dbdf5aa4530c0424eb02dae6a6bd6781e4e41b28373dfa0d317
font_01_sfnt_off000106ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 10696 bytes
SHA-256: 06548d3561165a6d587f7d8e163f60d46ea1ccba1a44142c906900cf5d8a7c9f

Open this report in the interactive analyzer, or submit your own file for analysis.