Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23005ace0270cac…

MALICIOUS

PDF

80.2 KB Created: 2021-04-19 10:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a5b87de9263975ae80a5e42084faa324 SHA-1: b134bcfe2c8b0655f126091a7305bb3c66f1ce03 SHA-256: e23005ace0270cacd5c162c43570b9d70696d376f7deabc5c7fdb1bf1d105cba
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, suggests a lure related to 'how to fix backlight on hitachi tv'. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a malicious intent to redirect users to potentially harmful content.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/strik?utm_term=how+to+fix+backlight+on+hitachi+tv PDF link annotation
    • https://cdn.sqhk.co/mixenezir/gLicohh/94145036412.pdfIn PDF document text
    • https://cdn.sqhk.co/sinupupuzaxa/b3T5Sup/colornote_app_help.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/jBje1sc/cars_for_sale_mn_under_2000.pdfIn PDF document text
    • https://cdn.sqhk.co/ferobisuw/Kd7jdig/botonutaloxogevevibex.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/0ighdwW/mowalo.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/I7YKVii/ralphs_burbank_hours_today.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/Thhgie6/xelajazex.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/jaiatQN/mojagetadimitebo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://todizugofufufax.epizy.com/pedaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec326916-4756-4a86-9c37-3c0057ebe44a/which_is_better_fitbit_3_or_4.pdfIn PDF document text
    • http://dipodowimovaxi.epizy.com/26738523950.pdfIn PDF document text
    • http://nerokigonone.rf.gd/sheila_sherlock_diseases_of_the_liver_and_biliary_system.pdfIn PDF document text
    • http://vekalaluno.epizy.com/33680220489.pdfIn PDF document text
    • https://b1394492-4877-47b1-8bf2-e962974baa99.filesusr.com/ugd/3e4b7a_014b2f0a953e430089d525cb45a54fcb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe84ce9-a625-4a95-b387-f4a2cba5fef6/how_do_you_change_the_time_on_a_citizen_eco_drive_radio_controlled_watch.pdfIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_dfa9af61142d4b8da7fb08a48d33df4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6134df-c11d-4ce3-8c3f-cba3a83de1b8/surapu.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_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 5252 bytes
SHA-256: 3a77a47373c8bc164ba54312e5fb02401e611006e3893a9c4e41086f761939b1
font_01_sfnt_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 11944 bytes
SHA-256: 2980577ad4b8d13e7a416b3f658baefb38f43213cc6c37377e3e150668b2b3da

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