Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cab49faf147e85d…

MALICIOUS

PDF

78.6 KB Created: 2021-03-18 14:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d346800dde1303364721fc7a72b721be SHA-1: e89e357e609c03bf6cf40af8f668ec92d759d456 SHA-256: 4cab49faf147e85d9880877b3e6d1d6fd642176c937a18e44b105e2782e015dd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=tense+consistency+worksheet
    • http://hamlikjorettoop.ru/45735316492ufgw3.pdf
    • http://marinarus.space/418913794280at9.pdf
    • http://pebunoguge.mygamesonline.org/calendario_laboral_2020_valladolid.pdf
    • http://italysummer.fun/gojataxinerokowaxous20p.pdf
    • http://juraxoxodas.scienceontheweb.net/what_is_the_magnitude_of_gravitational_force_between.pdf
    • http://characduwe.space/wejebemudof7h3o.pdf
    • http://igcopyrightclient.com/how_to_clean_a_wahl_clippers1ms6x.pdf
    • https://jupepirime.weebly.com/uploads/1/3/4/3/134313464/cde4251a11293b6.pdf
    • http://geekcods.com/878894741464oia1.pdf
    • https://xisobapujizutu.weebly.com/uploads/1/3/4/5/134585888/zagafazogo_kovuse.pdf
    • http://telgrm.site/how_to_repair_bosch_tankless_water_heaterlqdj6.pdf
    • https://jameropavide.weebly.com/uploads/1/3/4/6/134699307/fovulesu.pdf
    • https://lojopozubog.weebly.com/uploads/1/3/1/6/131606756/1545845.pdf
    • http://pixunune.sportsontheweb.net/biscuit_loves_the_library.pdf
    • http://jewlgems.com/dead_cells_switch_reviewe655s.pdf
    • http://fikosarodone.medianewsonline.com/ernest_l_martin_the_temples_that_jerusalem_forgot.pdf
    • https://vibitidit.weebly.com/uploads/1/3/4/7/134712982/miwagade_fogarapajur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_f529ba7802b343989c2b12749b199dea.pdf?index=true
    • http://dilutibu.onlinewebshop.net/lutapebupevefukedupoponox.pdf
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_52ff562801294f6f98da958f9690b70a.pdf?index=true
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_03858473c68640188b7597d0bc9eb04e.pdf?index=true
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_5da80205e6884db795278721bc58f8f8.pdf?index=true
    • http://rivenoke.onlinewebshop.net/23015996771.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e216.bin
be5f3991c2c1893451335a5e7932271fade008718739461be43bc7eec63107f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 4852 bytes
font_01_sfnt_off0000f2ae.bin
68ef538bd8eaf4bcb4f933614530af5d1cb4cc649f27a339af05ca8ae642006b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 10796 bytes
font_02_sfnt_off0001179a.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 16204 bytes

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