Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55cee3cbae9a795…

MALICIOUS

PDF

97.9 KB Created: 2021-05-28 20:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bbd82332b6fa0ddb054abd3c39e50319 SHA-1: c2dbe0fee5359ed40fdfcd373d886565ec16acee SHA-256: e55cee3cbae9a795c9d5a2e4c664bcab29c3bfdfdd2b4f857852a4fd8f45d095
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains or Weebly-hosted PDFs, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jumiwimov.ru/123?utm_term=beaglebone+black+board+datasheet PDF link annotation
    • https://bodupakodekafas.weebly.com/uploads/1/3/2/6/132680796/1436199.pdfIn PDF document text
    • https://tepukijamuboze.weebly.com/uploads/1/3/5/3/135301813/8a03a41d.pdfIn PDF document text
    • https://nepufetok.weebly.com/uploads/1/3/1/4/131438640/guwonariwakijodo.pdfIn PDF document text
    • https://bejejedagaf.weebly.com/uploads/1/3/4/8/134862385/fc2c2152f445322.pdfIn PDF document text
    • https://xazujojupise.weebly.com/uploads/1/3/4/4/134493550/3241180.pdfIn PDF document text
    • https://peramixirado.weebly.com/uploads/1/3/1/6/131637131/2da3fdf.pdfIn PDF document text
    • https://koduvorubosu.weebly.com/uploads/1/3/4/7/134719400/8985997.pdfIn PDF document text
    • https://fidejilajusaxe.weebly.com/uploads/1/3/4/3/134363993/a16609c78139.pdfIn PDF document text
    • https://fesunoxatufaf.weebly.com/uploads/1/3/4/5/134519878/8cee8da7369.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409255/normal_5fc57536c5227.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/1425283.pdfIn PDF document text
    • https://mefimume.weebly.com/uploads/1/3/1/4/131437875/vajoxenebapubi.pdfIn PDF document text
    • https://xexasatokotubeg.weebly.com/uploads/1/3/4/3/134354060/6109132.pdfIn PDF document text
    • https://gosaronazaniga.weebly.com/uploads/1/3/4/8/134851605/miwetozonovaxuz-wofigum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449771/normal_6005d07edbe81.pdfIn PDF document text
    • https://tadazumagitose.weebly.com/uploads/1/3/3/9/133987040/pulopuxam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504839/normal_5fcfa61760043.pdfIn PDF document text
    • https://kojoridenifuzav.weebly.com/uploads/1/3/1/4/131406931/3933939.pdfIn PDF document text
    • https://dojovirofolabi.weebly.com/uploads/1/3/1/0/131069789/26cbe61708fdda.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/9de3810a-1f1e-4a79-981d-9595d62f8304/50293130987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68444811-51e5-447d-b768-7070be0e33e9/nawasapebekibul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19d38d6-d704-4b93-b8bd-99d9be316d0a/67273413467.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_off00012f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F75 4524 bytes
SHA-256: b32fe4ebb7cb2d4da65ee59ac1e29036bc6addda5ef54bbf14c8f2ff52f5d298
font_01_sfnt_off00013f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F88 5456 bytes
SHA-256: 36ad2177f60050ec94c3858b367c4da1cc091df7484335f947c445e93d42079c
font_02_sfnt_off0001520c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1520C 11216 bytes
SHA-256: d7dc7ea5c3b54d611473df5424fce30288a656037b2d46663009867f5a5465d5