Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e54fba9c602c6d1…

MALICIOUS

PDF

79.4 KB Created: 2021-03-18 04:01:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eb93b147eecc712f516036216a89cccb SHA-1: af9acc097e3aa06128dde3d425ce8e41a528aea4 SHA-256: 5e54fba9c602c6d19d50b83604d959d1f71c58c8b3b91ea22988b54d4e11c376
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xajibur.ru/strik?utm_term=hp+5740+printer+driver+unavailable PDF link annotation
    • http://jeseselanus.scienceontheweb.net/administracion_estrategica_de_recursos_humanos.pdfIn PDF document text
    • http://rolivazugatar.scienceontheweb.net/avaya_one-x_communicator_headset_compatibility.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/22766454621.pdfIn PDF document text
    • http://xejepurefe.scienceontheweb.net/50_liters_of_oxygen_is_what_percentage.pdfIn PDF document text
    • http://bawoputameded.iblogger.org/73363976450.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/wibisagumeb.pdfIn PDF document text
    • http://zemixubekuj.22web.org/vorutugedobegawiraj.pdfIn PDF document text
    • http://selizixid.iblogger.org/winston_churchill_books_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/delonghi_espresso_machine_dedica_manual.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_c9c00ea175ff49168e560288b1ef71e0.pdf?index=trueIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_2f7f194852f947ef87bdcf529b01a663.pdf?index=trueIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_36b18b29e32948478eec38ce118896d6.pdf?index=trueIn PDF document text
    • http://jovebagubalolif.epizy.com/how_to_unlock_door_to_lady_butterfly.pdfIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_5cb7bf6a932444d59b1c36c3af01afe0.pdf?index=trueIn PDF document text
    • http://juborekif.atwebpages.com/nyc_economic_development_corporation_salary.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/elasticsearch_list_index_templates.pdfIn PDF document text
    • http://tunakaxawonisov.epizy.com/wovakomobuzal.pdfIn PDF document text
    • http://witigegewujal.rf.gd/wesisofijegete.pdfIn PDF document text
    • http://gorogukusesewu.rf.gd/genetically_modified_organisms_articles.pdfIn PDF document text
    • http://pazefinexudet.rf.gd/sukagodikukofa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 5140 bytes
SHA-256: 9d5bdf43c690ca81f1ee9ebb453714f7796f2d9d7c6cfbcd8e10902103fba7c6
font_01_sfnt_off0000fddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 10716 bytes
SHA-256: eed665680b94a4b19b39c5b2f02a909234d61e11b5c17e9e014a9a7d2c645350
font_02_sfnt_off000121fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361