Malicious PDF — malware analysis report

Static analysis result for SHA-256 4772e8ea80b4efad…

MALICIOUS

PDF

123.3 KB Created: 2021-03-04 02:57:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 89ea2446356f08f1138e192abd6e96b9 SHA-1: 3d0d35b9698c058639d0f65cd5ed87a1470bfea0 SHA-256: 4772e8ea80b4efad099509776f62f3fc4d1255e503f9f2070933bb76997fe3fd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wb?keyword=how%20does%20the%20linux%20kernel%20work PDF link annotation
    • http://bumaga.bz/auto_loan_amortization_excel_spreadsheetly1qk.pdfIn PDF document text
    • http://idealicaufficiale.website/yamla_pagla_deewana_3_movie_songevqqd.pdfIn PDF document text
    • http://zeropium.com/how_to_light_a_majestic_gas_fireplace_pilothzork.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375696/normal_5ff3810737522.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/ififWjb/3519773116.pdfIn PDF document text
    • https://cdn.sqhk.co/rasirise/hagjghh/23613122292.pdfIn PDF document text
    • https://cdn.sqhk.co/wokumima/gigjhcm/new_anime_stickers_for_whatsapp_2020.pdfIn PDF document text
    • http://capridigi.com/hieroglyphics_definition_egyptpp4qc.pdfIn PDF document text
    • http://afracheat6.xyz/iterative_deepening_depth-_first_search_python4sek5.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/yqjdzCP/castle_crashers_unlock_characters_quickly.pdfIn PDF document text
    • https://cdn.sqhk.co/banamasuvaj/dr4PifY/87678853973.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/JjgwjGM/ditokanivak.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/what_is_basic_business_mathematics1in8s.pdfIn PDF document text
    • http://bigwin-1xbet.fun/checkbox_in_excel_template6c80s.pdfIn PDF document text
    • http://lawyer-consult.ru/parerolozegolejop8f3tb.pdfIn PDF document text
    • http://yogait.space/708719972011mj7.pdfIn PDF document text
    • http://xbet1.fun/654394753707iait.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/GQje1id/any_cure_for_inclusion_body_myositis.pdfIn PDF document text
    • http://afracheat3.xyz/adjective_clauses_with_quantifiers_exerciseswqzlb.pdfIn PDF document text
    • http://importants.space/tcl_tv_reviews_32z2fko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AA6 4768 bytes
SHA-256: dec742a036289af46ba78467ff4c2d10b3c2298e66e338c81d7169214a541723
font_01_sfnt_off0001aada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AADA 11604 bytes
SHA-256: 4ea59268bec2ae6f62469e3e92c5ba75d3365abeda67a02de693e11ab117b9af
font_02_sfnt_off0001d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D174 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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