Malicious PDF — malware analysis report

Static analysis result for SHA-256 077f54c9f19d7816…

MALICIOUS

PDF

77.4 KB Created: 2021-06-08 09:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2ad935991ad5df077d572f7ceb40ae7c SHA-1: e18c487215a496132d29fe95a5ac51403e276500 SHA-256: 077f54c9f19d781696d5672703445dfdb5612998d6fcd850455103176ca21498
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a domain associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to salary information, likely intended to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://coretry.ru/pbw?utm_term=how+much+does+a+forensic+pathologist+make+in+canada PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419818/normal_6047f409226e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426080/normal_60be5561544a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418985/normal_5ff9ce38c6c71.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/185156de-0bbc-4307-912b-8c43729dc959/94566920641.pdfIn PDF document text
    • http://zuvuwiro.pbworks.com/f/norobanazibirika.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144611274/lijafofaxepudinekewojewu.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/tuxexufop.pdfIn PDF document text
    • http://kufugaref.pbworks.com/w/file/fetch/144687978/abstract_algebra_by_dummit_and_foote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6610d850-aabf-4534-a990-e4a22695aa4c/34244655644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3401ea75-057d-4d83-a675-4259ec555308/dd_4e_prestige_classes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40172885-eccb-458c-9315-2bd0e4e0eb8d/bissell_big_green_professional_carpet_cleaner_machine_86t3_best_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf140a3-1aa2-4f00-91b2-500f07b7f6ea/acca_nino_x_jean.pdfIn PDF document text
    • http://zawepiko.pbworks.com/f/78480786199.pdfIn PDF document text
    • http://fuzobonesujo.pbworks.com/f/wwe_2k15_android_game_free_download_for_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6be9712-59f6-4ed9-b4ed-18d78343b49c/monsters_vs_aliens_cast_imdb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b9fcbab-99a2-43e1-93bf-1fd9df99aa92/how_to_write_your_own_career_development_plan.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144562692/practica_forense_civil_y_familiar_carlos_arellano_garcia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc84420d-e1e2-490c-93a8-b5155196a07e/budididenurilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1850b5a-9e95-42de-8623-1b6527b80347/frida_kahlo_diary_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ff52a3-ca26-4230-9664-dd291b2f4b26/pajikexuxenofufobegigoda.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/w/file/fetch/144591912/81475722167.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_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 5684 bytes
SHA-256: 7b675f9275d09f5dacbf602604ab9f297b652ab1b4f5e2e9f711a2007899b787
font_01_sfnt_off0000fcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 12764 bytes
SHA-256: 8651affadc80fd56d8c6be0ffceeeb4f211692918bf981ba823f2819c051895d