Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d5b8aea77c6985…

MALICIOUS

PDF

78.8 KB Created: 2021-04-05 23:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3e154d9003b09954f18aaf6301b022b9 SHA-1: 97e2f4bffee938b34214ef53e5937d014120841c SHA-256: d7d5b8aea77c698536b95a8ac3bfa6494e72648ae3d7e14763336d8eafcf250a
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to annotation and security software, likely serving as a lure to encourage users to click on the malicious 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://botokaw.ru/award?keyword=annotate+pdfs+in+evernote PDF link annotation
    • https://cdn.sqhk.co/nokotadi/3dnDiEW/mcafee_security_for_t-_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/nisosawero/Cjfjbig/tauceti_vulkan_technology_benchmark_requirements.pdfIn PDF document text
    • http://kobopez.mygamesonline.org/deconstruction_meaning.pdfIn PDF document text
    • http://goldstein.capital/tisagutozapeliroluduxuvortf3fw.pdfIn PDF document text
    • http://gavolav.mywebcommunity.org/prevention_of_food_adulteration_act_notes.pdfIn PDF document text
    • http://mebevevi.mywebcommunity.org/what_should_i_write_to_my_godchild.pdfIn PDF document text
    • http://lozhobelir.space/maxomupefebuwukoximotegiuhf.pdfIn PDF document text
    • http://tonukavugu.mygamesonline.org/xabopuripurejiwunivobak.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/common_core_standards_illinois_ela.pdfIn PDF document text
    • http://drive4mclaneaustell.com/vigesifizuzelaxejosele6gvhr.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/saeco_espresso_machines_costco.pdfIn PDF document text
    • http://suporefebakibur.mygamesonline.org/nitudojabesegiwak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rorazizaxaf.atwebpages.com/subikigubuvamipakasuxig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83688512-5b38-46ac-9019-8545d160f557/bemepipasitiga.pdfIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_f0d83e8514f349aeab9ab8c95bf49fe6.pdf?index=trueIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_446fc387aa2445849b043b8c98d6eea5.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_5a3827fcc83c4d17b36d277ea1faffd5.pdf?index=trueIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_20ef78a1ae8d4f9b94c48fe2bed6c5d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4b1494-1e67-4008-9bba-c391bc6f28c0/nikon_prostaff_p3_3-9x40_silver_bdc.pdfIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_138dbc45d2ff437eb6cd8d3d92308381.pdf?index=trueIn 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_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 5052 bytes
SHA-256: 248537de61c7c36d3b3d0a9047504605fd67f7266beeaadc4c18847d3ef016e2
font_01_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 12460 bytes
SHA-256: 1d85820737d4c227e872100b35a2ec1041e26e12114061a24da2289997a23553

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