Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79650f6390bbb2c…

MALICIOUS

PDF

79.5 KB Created: 2021-02-26 22:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f0e463c14da00ab4f247b23a74b353fc SHA-1: 6e295381bc2e56c639053556542778d3be41bf0d SHA-256: c79650f6390bbb2c5ebd0288abe1514087f8d8d9bf92ecba191d934228af8b72
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests a social engineering tactic to trick users into installing malicious browser extensions or updates. While no scripts were directly extracted, the presence of numerous external URLs, some pointing to disposable hosting, supports the idea of a downloader or phishing lure. The document's content, though heavily obfuscated, appears to be a lure related to 'Kindle oasis 2019 how to use'.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jumiwimov.ru/strik?utm_term=kindle+oasis+2019+how+to+use PDF link annotation
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/bigajusen.pdfIn PDF document text
    • https://cdn.sqhk.co/paleguvebo/iTijTdl/poteberigadipevatukofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_5fd7dca16962d.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/dijgjig/roller_ball_bearing_table.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/igUckfc/dynalist_alternative_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/sepolulegaba/idiihcv/xidimesemupigike.pdfIn PDF document text
    • https://cdn.sqhk.co/vefutifeves/ejbjijc/realdash_link_ecu.pdfIn PDF document text
    • https://vuxutuwatojo.weebly.com/uploads/1/3/4/6/134625262/xokofanaf.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/hjheheB/lightroom_app_costo.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/banukezigowar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/limabefugakavosufotifik.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/nemabuboterex.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/what_the_bible_says_about_the_man_of_the_house.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/gefabixalawexabinuga.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/flora_bacteriana_normal_intestinal.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/stupor_and_coma.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/30745395328.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_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 5360 bytes
SHA-256: ed8ee792662c5899fae0fd4d414f3e11f8cd2fd70ecfcc61f3cb601278eb4df7
font_01_sfnt_off00010af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 10920 bytes
SHA-256: 188a2e78dcbb9fae349b3d30bc330f2628fe579d0652578a5a4d7e91122a3b09

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