Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca2cc82a261b359…

MALICIOUS

PDF

83.2 KB Created: 2021-03-05 08:48:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 434d191680281f1592362fabe331805b SHA-1: bc5ec75c4d5ec4e8280e6b6aa6d64e9f8c07455d SHA-256: 5ca2cc82a261b3594da10cafa49d17e578d3ed2159f5a7ff33962b09da79c1e4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and the document body, though partially corrupted, suggests a lure related to business checklists. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to potentially harmful content.

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://resalured.ru/123?utm_term=checklist+to+start+a+business+in+california PDF link annotation
    • http://rabifew.iblogger.org/android_x86_free_for_windows_7.pdfIn PDF document text
    • http://sport-stavki.fun/traffic_reports_m4_westboundqm2j8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473062/normal_5fcf2497d93fa.pdfIn PDF document text
    • http://tafiwon.mywebcommunity.org/bright_line_eating_meals_on_the_go.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503617/normal_5ffc3a10bdb70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_601ba902034c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487897/normal_60338a714a40b.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/kenmore_ultra_wash_3_dishwasher_parts.pdfIn PDF document text
    • http://all-casino.xyz/how_to_update_nook_hd5h2j6.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/hey_soul_sister_ukez7j7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415073/normal_5fe2c4152348e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445558/normal_5feccb5c26a2b.pdfIn PDF document text
    • http://consequences.space/chess_tactics_strategylj57v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://magikid.epizy.com/57208205157.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/corrugated_metal_roofing_sheets_home_depot.pdfIn PDF document text
    • http://ledolabufimo.epizy.com/26459608876.pdfIn PDF document text
    • http://bupazutorudazeb.epizy.com/what_is_pain_management_in_nursing.pdfIn PDF document text
    • http://nevabaza.atwebpages.com/25266431184.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/52574736509.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_off00010945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 5080 bytes
SHA-256: 156ce636144d56a2eecea27ac7163a961545ba5af27dd33eddadef0ed41e87ec
font_01_sfnt_off00011a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 10920 bytes
SHA-256: 0548a8324027789115d7c839a6154019163322adf7253d9f303f51ae431c11ea

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