Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f7c42557c04e54…

MALICIOUS

PDF

108.6 KB Created: 2021-04-07 07:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3a89babaf79d73773e1402173a56b5ce SHA-1: 9f9e500df608e762ff082935dd521f8c5d27b6fc SHA-256: b2f7c42557c04e54b2ba3bf16f12b2e0e2c6af24f523b9c7273f8728b5925cdf
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 flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to 'coin master cheats 2019', suggesting a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/wix?keyword=coin+master+cheats+2019 PDF link annotation
    • http://fabulouss.space/monkey_business_illusion_mp4_downloadfm9b3.pdfIn PDF document text
    • http://madusotiju.22web.org/cisco_system_vpn_client_windows_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483070/normal_606b924a88463.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372963/normal_5fee7e6e8502a.pdfIn PDF document text
    • http://quinzsy-studio.design/6389238564taz9m.pdfIn PDF document text
    • http://rusojir.22web.org/34881558923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471106/normal_5ffa0971bbfdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_5fea1aa7c8672.pdfIn PDF document text
    • http://trastenmyqort.online/sena_20s_evo_instructionspu73b.pdfIn PDF document text
    • http://devgame.design/linoxewepubutabm3qoq.pdfIn PDF document text
    • http://baderakavakuf.22web.org/associativismo_juvenil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445890/normal_605472629a41b.pdfIn PDF document text
    • http://mebelintera.ru/beautiful_boy_original_motion_picture_soundtrackwqlny.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/5707227119.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pidejejorojomon.epizy.com/purubifufaz.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_56984c37d99047a184f5d9caeba7a727.pdf?index=trueIn PDF document text
    • http://nazijomibak.epizy.com/html_link_code.pdfIn PDF document text
    • http://lobexot.epizy.com/parent_newsletter_template_word.pdfIn PDF document text
    • http://xosabunaledepof.rf.gd/que_significa_educacion_diferenciada.pdfIn PDF document text
    • http://xifeloj.onlinewebshop.net/77478916906.pdfIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_6cf82ac2b4cd4ae4ae9b6b0ec1f730c8.pdf?index=trueIn PDF document text
    • http://punegejofuj.epizy.com/basic_life_support_provider_manual_free.pdfIn PDF document text
    • http://lisuxuzilim.epizy.com/gettysburg_address.pdfIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_041a301a47f744f686ef84cb801ef718.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_off00016bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BAD 5392 bytes
SHA-256: a54fa3960f5970aaf8d2f96cfdda5c7775f7ff6937cabfcfa4bd25aef0756916
font_01_sfnt_off00017dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DCD 11620 bytes
SHA-256: ca97b68b622c27de9b63a40cb7920d4d7287605a777047772ac15e22f7f73afa

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