Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4c9385c2cbd146…

MALICIOUS

PDF

66.3 KB Created: 2020-12-23 02:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0d157735bdf26dfecbb361320e4b2a50 SHA-1: ecc5bf0548368ad65ff021d71cabe54c155634ee SHA-256: 4c4c9385c2cbd1468029547a557dbf911f07dc5443aa76cc6981ea65d382ce62
126 Risk Score

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 pointing to disposable hosting services, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using multiple distinct hosts with a high number of links, often associated with phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings strongly suggest an attempt to redirect users to malicious 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://traffnew.ru/strik?utm_term=how+to+make+origami+crane+with+origami+paper PDF link annotation
    • https://nagifinapu.weebly.com/uploads/1/3/2/6/132696111/mobez_rogirizexed.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/sovumuvidizisi.pdfIn PDF document text
    • https://nilukosezaxed.weebly.com/uploads/1/3/0/8/130814529/3887384.pdfIn PDF document text
    • https://bidovakufizal.weebly.com/uploads/1/3/4/5/134586087/2f6e03d647.pdfIn PDF document text
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/litamagul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f870c206f795.pdfIn PDF document text
    • https://getazaxebu.weebly.com/uploads/1/3/4/8/134866961/4860241.pdfIn PDF document text
    • https://gugagefa.weebly.com/uploads/1/3/4/3/134343265/tafimuxijojifivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc115d62bbd7406580792b0/t/5fcca0535177ea328cbd52f6/1607245910557/wordpress_remove_login_link.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9535164-1ad5-42f5-9008-32ad6b718a98/basic_immunology_abbas_6th_edition.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe021b0abcbbd6b4858f34c/t/5fe0701a6a6ad7222f487a9b/1608544283359/natuxevefafofivola.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fde88431076b30d0a95c29a/t/5fdec2d7459323513bd577ce/1608434396118/guxodogotolonopir.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1174eedf07488260e6da/1606226292713/the_servant_james_hunter_cliff_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff8e349-7569-41c8-affc-66e22a69d0b9/heredity_crossword_puzzle_answers.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_off0000c8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EF 5252 bytes
SHA-256: 94a969ece44ce98ecc2d0816e7270d4a0da9c2fda492a4631c2ee13179a88324
font_01_sfnt_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 9812 bytes
SHA-256: b9640690092d20f723e02ce9af8c3f3d7af73c448ba387da34e36fc5dc0fd4ad

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