Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f2f13581b4a062…

MALICIOUS

PDF

67.4 KB Created: 2021-03-01 11:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7d6d17385c06924c0915e6126918fe63 SHA-1: 8f593b101ef76f2010339981e4797904db48a759 SHA-256: 13f2f13581b4a062785930e2e3634a00c3da5b61daa1cd484f3fc6e740792771
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malicious redirection scheme. The presence of external URIs and the 'link farm' heuristic strongly suggest an attempt to direct users to potentially harmful websites.

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://bologen.ru/award?keyword=amplificadores+de+audio+profesional PDF link annotation
    • http://kamikofonem.mygamesonline.org/jadesojaxaxifipisubarove.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/85322559426.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/lepigexidokinajivuja.pdfIn PDF document text
    • https://fevujuwevu.weebly.com/uploads/1/3/0/8/130813851/delosenog_semomi.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/what_is_meant_by_the_origin_of_species.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/1336630623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480403/normal_5fdc6fc975fc9.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/how_to_use_ridgid_wet_dry_vacuum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedixemalirugi.atwebpages.com/wesobotutudepivogene.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/seeds_to_plant_in_january_florida.pdfIn PDF document text
    • http://xosevijus.epizy.com/logitech_gaming_software_arx_control.pdfIn PDF document text
    • http://lapetagalelan.myartsonline.com/nintendo_dsi_master_key.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_off0000c7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F5 5288 bytes
SHA-256: 823910efb1314433e02f219cf3c3a304d905ee90d53ad0890836a2e35da3c395
font_01_sfnt_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 12040 bytes
SHA-256: be029102431e4f444344ec8167e64a637f7d231bb387f1b27834e55eaf424fef

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