Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b13ff1f9f1ac799…

MALICIOUS

PDF

82.7 KB Created: 2021-02-26 10:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c704331757efda609d9c5fc4f8582f8b SHA-1: 986814ce40bdf008f42a67c63e1bb580c323b6cc SHA-256: 7b13ff1f9f1ac799e644b21b0c5059ccd1242935f55ee71e34e82bab002cab0c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://xajibur.ru/strik?utm_term=are+you+afraid+of+me+quotes PDF link annotation
    • http://fesebenawasoz.iblogger.org/multi_stage_theory_of_carcinogenesis.pdfIn PDF document text
    • https://rogefuza.weebly.com/uploads/1/3/4/6/134688393/2058245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447253/normal_60197850180db.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/wuwoxib.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/18_hp_vanguard_oil_type.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/minecraft_windows_10_free_download_full_version.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/fixararololu/fosojako.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/nc_drivers_license_test_quizlet.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/gerozix.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/91425987329.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/2860811068.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/learning_and_acquisition_of_english_language.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/falciform_ligament_of_liver_location.pdfIn PDF document text
    • http://sugazaxarul.epizy.com/new_holland_tc30_hydraulic_pump.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/attendance_allowance_claim_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/desi_brahman_song_pagalworld.pdfIn PDF document text
    • http://gozajogef.rf.gd/change_of_authorship_request_form_springer_nature.pdfIn PDF document text
    • http://xonikinoforekan.rf.gd/la_riqueza_de_las_naciones_libro_1.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_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 5240 bytes
SHA-256: 4d985952606d8c7e763af6e53ecfb4ab7094dc43003aab58c69e7cfef741360a
font_01_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 11444 bytes
SHA-256: 22ccf46ba34b3a19de2c0efe094d849bf196e7c9ce48ec178fa86248ec2d7b95

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