Malicious PDF — malware analysis report

Static analysis result for SHA-256 842201fc3d189b5c…

MALICIOUS

PDF

76.5 KB Created: 2021-03-19 03:50:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dbbf9dbe585ac60e57db9e9f05332a0e SHA-1: cdb7de53b24cdf02ab7fc63ad557a4ddc82e918e SHA-256: 842201fc3d189b5cf03d8ba2bb9731e63216799bf0f50b3c533aa1a62f624c42
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs, with one notable example being https://leonvi.ru/wix?keyword=human+body+pushing+the+limits+sensation+worksheet, suggesting a link farm or phishing lure. The document's structure and embedded links indicate it is designed to redirect users to potentially harmful websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://leonvi.ru/wix?keyword=human+body+pushing+the+limits+sensation+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380219/normal_5feda1d556eed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456376/normal_60377b6e2daff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423166/normal_5ffdb161eb59f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385202/normal_6027f2a88c355.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404122/normal_5ffb2f367bc14.pdfIn PDF document text
    • http://gibelineg.sportsontheweb.net/autobiography_of_benjamin_franklin_by_benjamin_franklin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494138/normal_6050c7f3393a9.pdfIn PDF document text
    • http://likefetevu.getenjoyment.net/71254927156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446490/normal_600eb01327fc8.pdfIn PDF document text
    • http://piwafudenipaluw.66ghz.com/zowukabobutulis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_919f1bfe1cd0451e97bcdebfe521a07f.pdf?index=trueIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_f95f1ccb206b4b9cae5db05b400cee3a.pdf?index=trueIn PDF document text
    • http://bolutiso.epizy.com/formation_brancardier_gratuite_paris.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_b596283b77d049db9abc2faf7beb4fc7.pdf?index=trueIn PDF document text
    • http://vumesurev.epizy.com/zugupetubedeta.pdfIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_016a02188e814c6998ae2e1a8b91e986.pdf?index=trueIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_8c828945cb4a4e58ab8767dbfc7ee9b0.pdf?index=trueIn PDF document text
    • http://zaxowudupa.rf.gd/80826008046.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_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 5732 bytes
SHA-256: 77574fdd73181d52de2926395e1855a5deaa4684ec1ee40ddf5c6baa37831d88
font_01_sfnt_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 10744 bytes
SHA-256: 3ca7cdbab183edc658435bd0e21b5c8b32374f15ea310440b81397364446898e

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