Malicious PDF — malware analysis report

Static analysis result for SHA-256 c437ac1c5f4eaf5e…

MALICIOUS

PDF

76.0 KB Created: 2021-03-15 05:19:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b87e3870029f89f06a12f17797928de SHA-1: bed629a4870a414c380fbe05fb7968ce6a8dc2a6 SHA-256: c437ac1c5f4eaf5eded6e428b5923efe395690b3c616f0c4041f07e882cf989b
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it's a phishing attempt. It contains an embedded URL that redirects to a domain associated with malicious activity, likely to host a phishing page or download further malware. The document body, though truncated, suggests a lure related to a Samsung Galaxy Tab update.

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://xezojetit.ru/strik?utm_term=samsung+galaxy+tab+4+7.0+sm-t230+lollipop+update
    • http://waparudadip.mywebcommunity.org/new_john_deere_garden_tractor_prices.pdf
    • http://jigapenufi.medianewsonline.com/how_long_should_a_personal_statement_be_for_scholarship.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/df9f524f-f69b-4654-8805-2ab8c94e86c7/sexual_reproduction_and_asexual_reproduction_definition.pdf
    • https://uploads.strikinglycdn.com/files/4ac58df8-7d64-45a9-ac26-b8fd6f37a4c6/kumemujoporukolut.pdf
    • https://s3.amazonaws.com/wiwuxot/flammable_storage_cabinet_requirements.pdf
    • https://s3.amazonaws.com/rimepusox/real_estate_market_definition.pdf
    • https://uploads.strikinglycdn.com/files/835180bd-f0ad-403d-bff0-f44cf1f5a54a/94330373307.pdf
    • http://vawirir.atwebpages.com/dell_inspiron_n5010_ram_compatibility.pdf
    • http://vekisofekibote.myartsonline.com/albumina_humana_grifols_bula.pdf
    • http://rakorasalonolit.rf.gd/beweromutudat.pdf
    • http://podugidak.epizy.com/32968512245.pdf
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_35ef1c5dcefb4595a04992ff15b860ab.pdf?index=true
    • http://lojetewope.epizy.com/rejubetelerepoguj.pdf
    • https://s3.amazonaws.com/dekogamik/89550038891.pdf
    • https://s3.amazonaws.com/fojaxexino/ketinunasalujobisanozago.pdf
    • http://supabije.rf.gd/blender_3d_free_64_bit.pdf
    • http://wenulusevikofa.myartsonline.com/bunedivefewewujelaronen.pdf
    • http://zorijefugixor.atwebpages.com/is_genesis_a_good_mountain_bike.pdf
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_91b866e343bd4b27a1bda633673d4518.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e829.bin
9801d46c21688d3d5c8ddc3b0eefbff8ee1f4fb8dd87012649c699f3b15bc661		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE829 6264 bytes
font_01_sfnt_off0000fd88.bin
2d11a0e433d1c4d7dc1c2a158ff52c0b3a47daad2b538fe65a3d54b183553d43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 10940 bytes

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