Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32d67224ed2ac9f…

MALICIOUS

PDF

78.5 KB Created: 2021-04-11 07:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 89984690f4753c46452f1dce52b7a519 SHA-1: d9848db96e84dd50b3e7e8b8deb9c61f241d2c0b SHA-256: a32d67224ed2ac9f85bab8fb06c49315285fa45f2baf0a7a614adde956d02a5c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=numerical+recipes+pdf+github PDF link annotation
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://luminar4-download.xyz/dadipigoxijivanow917m1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488101/normal_60635783343f6.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/statistical_models_theory_and_practice_2nd_edition.pdfIn PDF document text
    • http://confirmationhelpcenter.com/gilebunagemutuxk4w8y.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/89627357705.pdfIn PDF document text
    • http://zogometemo.sportsontheweb.net/kirubemitukepazisew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457849/normal_6061173d66727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_60534ac037dd7.pdfIn PDF document text
    • http://kupiokno.su/diccionario_espaol_portuguesd4ykj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://newemepakirid.myartsonline.com/jukijawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaa488e8-87b3-403a-8cd5-62e54f094e10/interior_design_course_online_free_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7352ea-3d37-41e4-8f96-43f35a8e0e84/lower_bollinger_band_screener_chartink.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44c908e1-a39b-463a-a86c-1940f0c162bc/fuwofizalifasogu.pdfIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_53925d8104f84bf4a6b104672bfc8e5c.pdf?index=trueIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_2e0aefb799fb4ad8be150b6908749450.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed913c4f-6f7a-46da-aa16-f66d9125cf04/is_kf_an_acid_or_base.pdfIn PDF document text
    • https://b66a6cc6-7028-4fd7-9d19-084b2b27c535.filesusr.com/ugd/4015cf_e83cd70b70aa47dfa87f26e952527b7a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d7ed562-2738-430a-bd70-261b3421f078/98831220521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8594354-9d1c-4967-8634-988a93c7c355/96482842343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75109a9e-0c38-466f-89d2-68e8fffcb64b/11185189857.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_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 5680 bytes
SHA-256: b00aa6b04b281ec8ed48e86df3c75feaf049788af71281c9cf6cda381513f881
font_01_sfnt_off000104a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 12004 bytes
SHA-256: 8d55f6a7ad63e2ff5b034dfde6baa1462fdf8df1ce5bf2bfa42dbb5ad053d00a

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