Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e88418117a687d1…

MALICIOUS

PDF

80.8 KB Created: 2021-02-22 07:12:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e0e7a67f55e900220961da1e3a13e491 SHA-1: f60c632a9ed9f14d4135aee69da51c620c9e1e75 SHA-256: 2e88418117a687d187ca01cf46260eb1b8228f37f3509558bcc60e02d7b20df3
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 and Weebly-hosted files, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=conscious+discipline+books+for+toddlers PDF link annotation
    • https://cdn.sqhk.co/kulukopupiw/igjDkii/gegowez.pdfIn PDF document text
    • http://vashastrahovka24.ru/7796396597591s2x.pdfIn PDF document text
    • https://cdn.sqhk.co/demexadol/hcig05m/duxixaxajasumopudoba.pdfIn PDF document text
    • http://gufutaca1.xyz/adding_text_to_photo_android1aahl.pdfIn PDF document text
    • https://tabutepapuwup.weebly.com/uploads/1/3/0/7/130740025/7815601.pdfIn PDF document text
    • http://good-production20.site/gufolanakuxul41i6t.pdfIn PDF document text
    • https://wamebadafexu.weebly.com/uploads/1/3/4/0/134040762/1fbe1bae4ec.pdfIn PDF document text
    • https://sorudexene.weebly.com/uploads/1/3/1/3/131384015/150b2b460bd398.pdfIn PDF document text
    • http://topcreditcheck.info/wijurazapivizerj56ub.pdfIn PDF document text
    • https://vusimipemukebev.weebly.com/uploads/1/3/0/8/130814393/kiwukofabasozek-romekolejeki-buvoz-gukasovulawe.pdfIn PDF document text
    • https://ditomivowulute.weebly.com/uploads/1/3/4/6/134679561/7b04f273fdf099.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/9mibeie/plants_vs_zombies_2_pc_download_direct_link.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fapugiv.rf.gd/drenaje_filiforme_que_es.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/29248372537.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 5048 bytes
SHA-256: 50edf6074246a33e8886cb5f644ea557fad21c4770a1ea4e3e9b62707ad98c1f
font_01_sfnt_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 10828 bytes
SHA-256: 41205f4efeda64f41fc31c0526922c7e05a5815212741052ef80c1f9767ea495
font_02_sfnt_off00012070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 16168 bytes
SHA-256: e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443

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