Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbb50f4916cd356…

MALICIOUS

PDF

72.4 KB Created: 2021-05-17 05:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3098231a3964bb81e3d53ea91c88cfe0 SHA-1: 16a53bfcc2c176f648f5e0b5a922cf138b2da207 SHA-256: 5cbb50f4916cd3561c6088251a7d8f1cb7e84f606e7b78495f6170635dc2d61e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body contains a title suggesting a technical support lure ('How to fix a Westinghouse TV with no sound') and embeds numerous URLs, one of which is directly linked to a potential phishing or scam page. The presence of external URIs and link farm heuristics further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/strik?utm_term=how+to+fix+a+westinghouse+tv+with+no+sound PDF link annotation
    • http://smartycredit.info/235836421519i9cm.pdfIn PDF document text
    • http://flymoney.net/886972894259abrl.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/aWhcwih/amazon_seller_central_customer_service_phone_number_usa.pdfIn PDF document text
    • http://kyrgyztours.com/zoniniluvoxodipuzikowolzmjti.pdfIn PDF document text
    • http://leaninrzpd.site/format_code_html_javascriptf9cbc.pdfIn PDF document text
    • http://heliusdesign.ru/republic_of_doyle_cast_season_3_episode_55do2n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527747/normal_5fc90704d12d7.pdfIn PDF document text
    • http://3-bureaureport.info/59950788466um33z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_606a2bfd026b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485457/normal_603e9a0db4932.pdfIn PDF document text
    • http://bonboxstudio.com/electrician_apprentice_practice_test_freeecfkn.pdfIn PDF document text
    • https://cdn.sqhk.co/zegegajugot/hfgjEhe/37343987799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_5fd1742e3b445.pdfIn PDF document text
    • http://vkysnaya-eda.site/bio_rad_cfx96_user_manual3z8dj.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuzoda/jdNhbjd/soundbar_sony_ht-_rt3_manual.pdfIn PDF document text
    • http://hustlinmoney.com/dictados_musicales_1_profesionalc53uz.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/Ajdjjf9/the_manager_of_a_public_swimming_pool.pdfIn PDF document text
    • https://cdn.sqhk.co/fesoxuleri/Jjiawig/viridexux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kimamewaseziwal.epizy.com/basic_knowledge_of_electronics_engineering.pdfIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_8e13345cb0f14ddf9b4f2c7d0188fc1a.pdf?index=trueIn PDF document text
    • http://jopavufugas.epizy.com/lowedosupemev.pdfIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_dd9eaaa4266f48728d0cff4651db9e29.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_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 5220 bytes
SHA-256: 5cba74b4ec996ee7a7e110a314f5d27abc9df4aabc9367e796bcb7418bf764e3
font_01_sfnt_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 10752 bytes
SHA-256: 242397352b3938e66a180ca1e621897ae265db1b596391f6d1ac4c223b4deaba

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