Malicious PDF — malware analysis report

Static analysis result for SHA-256 95faedc6f8b25e8c…

MALICIOUS

PDF

79.1 KB Created: 2021-03-18 17:26:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0fa01363f7a834e3763a472f0299e237 SHA-1: a8df36ffeea4510997966cd6f85c2d0ab1ae9a2f SHA-256: 95faedc6f8b25e8c4374a2e99b57b800d23de4969dfbc5dc25dda9ae9f7c1af1
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to various domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this, indicating the PDF is part of a scheme to manipulate search engine results or distribute further content. No scripts were extracted, but the presence of many external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://golowaki.ru/wix?keyword=ffxiv+miner+leves+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370074/normal_601231f67f79f.pdfIn PDF document text
    • http://sirunome.mypressonline.com/gedisisageb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369305/normal_6008703aa0e48.pdfIn PDF document text
    • http://copyrighthelpcentral.com/polininevenisegevif1aq34.pdfIn PDF document text
    • http://masito.space/juluvad6phi3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_6020d03f47b0c.pdfIn PDF document text
    • https://kevavabine.weebly.com/uploads/1/3/1/4/131406582/durirejimubo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379380/normal_5fe22f4077741.pdfIn PDF document text
    • http://telgrm.site/vtech_phone_answering_machine_manual7gswm.pdfIn PDF document text
    • http://itfamily.info/7408674653uokoi.pdfIn PDF document text
    • http://muvirire.22web.org/xowuz.pdfIn PDF document text
    • http://ellmax-site.xyz/40365975712jt29q.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/xodolorakuwepob.pdfIn PDF document text
    • http://igcopyrightclient.com/xegidebof6eej.pdfIn PDF document text
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/5839183.pdfIn PDF document text
    • http://kemytbok.xyz/jackson_json_tutorialyfzee.pdfIn PDF document text
    • http://setixin.iblogger.org/average_starting_salary_of_mechanical_engineer_in_usa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503987/normal_5ff0d54c302e4.pdfIn PDF document text
    • http://car-test.pro/wagabexefanilozspo7v.pdfIn PDF document text
    • http://testertumentum.space/81423813818bs95.pdfIn PDF document text
    • http://nadozigipak.22web.org/19940396862.pdfIn PDF document text
    • https://vowexigap.weebly.com/uploads/1/3/1/6/131636774/manamuti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 5100 bytes
SHA-256: 049092bae48b70c9adcd4ac446003696b745df89afbad7ee825848af3b030a60
font_01_sfnt_off00010b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 10608 bytes
SHA-256: 52c5391700598b039eb1f4b942824949fa68cd1198a99bbef7c55116da607791

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