Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a331090819f8145…

MALICIOUS

PDF

81.5 KB Created: 2021-05-15 21:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5c9b80b309ace456a2908b4961a623a3 SHA-1: 597eea2a5977ed2d4cf643e82e33dae97224c590 SHA-256: 9a331090819f81455c64ac02dc7cff86d05c84e6ce68caa32e15770a84221ba9
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 0.9998

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://fokemale.ru/strik?utm_term=ge+advantium+120+not+working PDF link annotation
    • http://datovufes.scienceontheweb.net/fazez.pdfIn PDF document text
    • https://zolaverapudo.weebly.com/uploads/1/3/0/8/130874102/668783.pdfIn PDF document text
    • http://benevesegok.iblogger.org/fales.pdfIn PDF document text
    • http://sagunutu.medianewsonline.com/radibubuxegivu.pdfIn PDF document text
    • https://nituxokijawagez.weebly.com/uploads/1/3/0/9/130969825/zumagijinuxalu.pdfIn PDF document text
    • https://mijonogopo.weebly.com/uploads/1/3/5/3/135327524/wixosapola.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/152b4f86-eab1-4e78-a09e-79fe0b5f95c6/consejo_escolar_de_participacion_social_hidalgo_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/88727767135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d867f5ca-bad6-4c1e-bc80-bc085b17ee9b/cien_aos_de_soledad_resumen_por_capitulos.pdfIn PDF document text
    • https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_57c1da4ec0424df59bd0b965d4847c52.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/31834861979.pdfIn PDF document text
    • https://a1b876fd-e98f-4594-996d-fc523792ae9e.filesusr.com/ugd/efcbf0_6aeafd8589ed4b31bfcc9507713b00dc.pdf?index=trueIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_84cecd8c6069488284fe05f53e726958.pdf?index=trueIn PDF document text
    • http://nazedizabif.rf.gd/41405176868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abef8e00-bc2e-4149-80ff-e820f45cb896/letter_of_credit_bank_of_america.pdfIn PDF document text
    • http://difatatufoze.rf.gd/97395053691.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/36596399396.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_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 5508 bytes
SHA-256: ad33ab5f6289af54e9a1b0ce4475202bbab51b50b36b785164255a3f6fac3581
font_01_sfnt_off00010eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB8 12044 bytes
SHA-256: 8788ab1ff3d1848fc66329952eea86e8fb6cd6dcdb3e1285b764d2e72bcfe13a

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