Malicious PDF — malware analysis report

Static analysis result for SHA-256 af582a768b075fb9…

MALICIOUS

PDF

87.4 KB Created: 2021-04-05 07:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0a3b5278fba90f577cd2f76061eaeb76 SHA-1: b3b9a0c1fa0db5b3dbe688639530fff65fe6be23 SHA-256: af582a768b075fb97903a5dc1d9084f49bcc621fc77cd7378219d8985999d559
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics, including ML and ClamAV, as malicious. The document body, though heavily obfuscated, suggests a lure related to appliance usage. The presence of a link farm on disposable hosting and a specific external URI points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=how+to+use+the+haier+washing+machine PDF link annotation
    • http://nuxulaxidiga.iblogger.org/affect_vs_effect_worksheet_with_answers.pdfIn PDF document text
    • http://ninomut.sportsontheweb.net/second_conditional_exercises_worksheets.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/risk_management_in_software_testing.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/60518599350.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/senogajumifalaret.pdfIn PDF document text
    • http://wuwisometojone.66ghz.com/humane_labs_deliver_emp_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sugamane.onlinewebshop.net/rojopimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba551dbc-e4fc-461b-8e03-7d2985b6b58f/jaybird_x2_buttons_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/campbell_biology_9th_edition_moodle.pdfIn PDF document text
    • http://malinaliwul.epizy.com/19852244256.pdfIn PDF document text
    • http://nubirumoxid.onlinewebshop.net/razurexot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/436f5170-0fd7-4af2-a3a3-5a82a69d16a2/hp_designjet_500_42_plotter_driver_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/30600680736.pdfIn PDF document text
    • http://lavofedelozus.rf.gd/13509622894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41031a2e-b325-45ed-8066-9cf33a73f783/how_to_reset_wd_my_passport_ultra.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/zavexokop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4db076b-9af5-4aae-99b1-383188b13c35/mr_heater_big_buddy_with_fan_canada.pdfIn PDF document text
    • http://mekasesajiw.onlinewebshop.net/bank_english_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e58bd64a-02d7-4a8e-996d-eb6354240926/9363058324.pdfIn PDF document text
    • http://zadabodemuliju.epizy.com/effects_of_plastic_pollution_on_environment.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 5236 bytes
SHA-256: beed58acf2060dbef5b8f88de091846901c2684ef46502348845ec56ee527c39
font_01_sfnt_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 10840 bytes
SHA-256: 2e1bdb4caf3b50e18d4a3c1dcf6a175c6f19f0d5633e42381447f7cae7c13552
font_02_sfnt_off00013a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A55 16148 bytes
SHA-256: 51babe3b44e703ca5a92278b053c112c5c116674d3b708c8e2cb3e4aa6bd9a04

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