Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63f1fc68e9fdefe…

MALICIOUS

PDF

79.2 KB Created: 2021-03-20 08:14:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: eca2f39a3752eea5c9397e8349a1a11f SHA-1: ba75b13cb8ff813e8c4f9ed4df9a8aa93edb5207 SHA-256: a63f1fc68e9fdefe4991d34efc815b98a8b9b306e6604815743acfaf015cb109
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-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://fokemale.ru/wix?keyword=boxing+summer+camp+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422659/normal_604b37c741afd.pdfIn PDF document text
    • https://tetufimaburovi.weebly.com/uploads/1/3/4/0/134098130/lijusiwolavobojexad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410216/normal_5ff7c4e3256d1.pdfIn PDF document text
    • http://googsnat.space/waec_biology_practical_past_questionshyt42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_5fe7d43292d46.pdfIn PDF document text
    • https://dozisinabi.weebly.com/uploads/1/3/4/6/134646642/kafitojiluweri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_600c145c24d65.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/gfrVgeg/libowafufinutupogakago.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368222/normal_60087d3fd789e.pdfIn PDF document text
    • https://cdn.sqhk.co/samekikogeri/i9Lsjac/zumujirepowixilopeka.pdfIn PDF document text
    • https://barosowuni.weebly.com/uploads/1/3/1/3/131398377/44661bfc42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465687/normal_5feb54141e471.pdfIn PDF document text
    • http://blockhcain.host/agthx_ytd_performancermmpv.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/a5876b02-d75b-4169-a4b6-df19b34d5260/60325255176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf9d88c2-244e-438d-9616-1d9948de9289/sosinawimuwojixikafejole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50fed29b-1038-4439-9c52-557d55e37683/verbos_frasales_en_ingles_y_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d13cfc-88b4-4f74-9a20-5f97fee6844d/8634817001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/802adb56-2759-46bd-829f-1cac8656d520/how_long_does_it_take_to_charge_a_ti_84_plus_calculator.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_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 5820 bytes
SHA-256: 0e6a014e27a74ce8e69c10f8b489fcbadc53c2a578840443011debf0557dcd8e
font_01_sfnt_off00010baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAF 10688 bytes
SHA-256: 650bd7c94fdbf24e4ad2a416d2ec91560f626709c99b4fcb1759b768be823d60

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