Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff2e8ce398cbe20…

MALICIOUS

PDF

71.7 KB Created: 2021-03-12 17:30:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 47ec0dde54e2e03042e03bec27d84915 SHA-1: b0b2fc6d7c1c0431a84b0a5c08ee5cd618537e7a SHA-256: aff2e8ce398cbe20ca3f38c0443c64445d896175463ea3d3a600121858d03a17
126 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'capacitor formulas pdf', likely intended to trick users into clicking on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/award?keyword=capacitor+formulas+pdf PDF link annotation
    • http://juzufezike.mygamesonline.org/vuxagurilor.pdfIn PDF document text
    • http://videohost.space/50058011497v6roj.pdfIn PDF document text
    • http://idealica-official-it.website/tozagatugexu6yq60.pdfIn PDF document text
    • http://basiditdcf.space/blender_2._76_64_bit3jj4t.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/jagofolo-vapamiwokije-balaxodujaz-jujeteruva.pdfIn PDF document text
    • http://polobasopika.mywebcommunity.org/54980477722.pdfIn PDF document text
    • https://mofegagopabelem.weebly.com/uploads/1/3/1/4/131438130/wopofixak_gisivij_tixepoboxitopu.pdfIn PDF document text
    • http://greatholl.com/gitaxunegukidebuzabewoponlzp44.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/11-4_areas_of_regular_polygons_and_composite_figures_worksheet_answers.pdfIn PDF document text
    • https://taruzalo.weebly.com/uploads/1/3/5/3/135398133/fobutora-bodon-jolixixinejas.pdfIn PDF document text
    • http://texewofe.22web.org/48315950624.pdfIn PDF document text
    • http://pewagupudasita.22web.org/39973624637.pdfIn PDF document text
    • http://kebenoda.scienceontheweb.net/blacksad_online.pdfIn PDF document text
    • http://kiruvoxexuk.iblogger.org/70876694357.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/zagononuwenafilem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xafekejo.epizy.com/ways_to_prevent_climate_change_at_home.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/fundamentals_of_physics_5th_edition_download.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_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 5208 bytes
SHA-256: 38a261b6b3f959ac961450ec6e41bf526c89aaf1b4eefdcb15bcdaf5eda12f74
font_01_sfnt_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 11232 bytes
SHA-256: bbac0ee24af67c2ff3e238e6839fb8500451673f6cc31518da0351d75b5bf9e8

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