Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3590537e10fc2b…

MALICIOUS

PDF

72.3 KB Created: 2021-05-22 20:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ae35fcdb69196c2f14608359b6dc90a8 SHA-1: 1a4f586da014e7e5cefab78752d3e6d8ec0f9a89 SHA-256: ed3590537e10fc2b07243c3bace845f0080c85728e22fd6950d4d80528ced46e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially malicious sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=does+meiosis+occur+in+plant+and+animal+cells PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420239/normal_6049c520986ac.pdfIn PDF document text
    • https://linonojito.weebly.com/uploads/1/3/1/3/131380720/1742273.pdfIn PDF document text
    • https://fupomojokom.weebly.com/uploads/1/3/4/4/134458651/53948cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409393/normal_6020bb9579b80.pdfIn PDF document text
    • https://demijejave.weebly.com/uploads/1/3/4/6/134607426/kipatowavap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460055/normal_604d129423c6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374196/normal_6000c2eee8887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500440/normal_600c80a5e3d33.pdfIn PDF document text
    • https://peniluvemafoni.weebly.com/uploads/1/3/4/7/134705148/70242d92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427499/normal_6040077505663.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489042/normal_5ffb8e25616f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373768/normal_5fca23b0922b6.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/2c8636e9-1222-4080-84b8-a594a93599b5/36777055476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e49c6d6-185b-40c9-985d-570319f26269/fopebipexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af5f44e-2159-4707-b542-091086784cfd/648985053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b976c8f4-35ce-4160-9dc3-751a1e64d02d/giteriwosibutixodo.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/woludokipekakufetejemefu.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/life_fitness_9500hr_elliptical_cross_trainer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4932d237-8c50-4f13-97d2-01023020d9ee/how_to_connect_to_ooma_telo.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_off0000e0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D0 5220 bytes
SHA-256: d3b17516e762ced44f221ee62be7c86819cce0b028ed9bfca3f9593487f2714d
font_01_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 9772 bytes
SHA-256: 70d244df39ea1ba7884e34e0771f202a317955080a6ce1347746763ff621bb92

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