Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5eac77a6cd6898…

MALICIOUS

PDF

33.3 KB Created: 2020-10-04 18:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5ab868011acea65ced76d0c9825686bb SHA-1: 7b0faa0d0863be29c1f8a5f6db587c2e805855f8 SHA-256: ed5eac77a6cd68989c5c7454e4a392624c98b0ea08037911e99b5e954dc976bd
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a known malicious URL, disguised as a guide for resetting a Hitachi inverter AC remote. The document body and heuristics indicate it is a link farm hosted on disposable infrastructure, designed to lead users to malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?keyword=how+to+reset+hitachi+inverter+ac+remote In PDF document text
    • http://loxudon.greenecountyunitedway.org/uploads/1/3/1/3/131384495/zakuru.pdfIn PDF document text
    • http://latasefa.royaltygear.net/uploads/1/3/1/3/131383309/vuwovosuwileru-fujeje-libepatetepunux-lalavepeputumar.pdfIn PDF document text
    • http://files.careandshareforautism.com.au/uploads/1/3/1/4/131437029/jafivadazo.pdfIn PDF document text
    • http://kemokixi.restorationsheridan.com/uploads/1/3/2/6/132681296/jusilifapikube.pdfIn PDF document text
    • https://site-1040681.mozfiles.com/files/1040681/71584465607.pdfIn PDF document text
    • https://site-1036958.mozfiles.com/files/1036958/31222516639.pdfIn PDF document text
    • https://site-1039435.mozfiles.com/files/1039435/93563441568.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/83c470e4-1807-40da-8c33-a4dfaa9144be/xefuwefonuravojezured.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edabf9e6-a63d-4b3c-ba0c-e6d310c5012e/51774257530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d27a9a2-10a7-43fd-a846-dad6024d55dc/danedimarupoxezusomitokuk.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_off000045b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45B3 5120 bytes
SHA-256: 717f872c67becb0e03d4b6c3a146f070e1e2178b3794ba3840c3663a1cf9d399
font_01_sfnt_off00005708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5708 9864 bytes
SHA-256: 4a71039ae77dda8d04b1db507eb162f787fb8f897a92fb8a814406c22819a9e1

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