Malicious PDF — malware analysis report

Static analysis result for SHA-256 71057e3c642184d0…

MALICIOUS

PDF

74.5 KB Created: 2021-03-20 06:03:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e9978076f889e09e8311f6129a179d23 SHA-1: d2096eb039fb4c8031728c5f85787a693173d568 SHA-256: 71057e3c642184d01fa17cc0e22a55bba1234900fc7a742a5c920c9efb8f227b
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a domain associated with phishing and link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a site that exploits them. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to facilitate a phishing or scam operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/award?keyword=fusionner+supprimer+page+pdf PDF link annotation
    • http://muzotom.22web.org/diagnostic_microbiology_mahon_free.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/ptf4hdL/crazy_train_snake_game.pdfIn PDF document text
    • https://cdn.sqhk.co/pivatiwon/jNxSJ0J/6162453944.pdfIn PDF document text
    • http://neridipazaf.22web.org/nikon_dx_af-s_nikkor_55-200mm_f_4-5.6.pdfIn PDF document text
    • http://bamulojamojexut.22web.org/9697195375.pdfIn PDF document text
    • https://cdn.sqhk.co/najuvotuwoz/dhjjiid/silver_cloud_inn_seattle_centurylink.pdfIn PDF document text
    • https://cdn.sqhk.co/gulizate/Axjcb37/pokemon_go_level_50.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/chco7gf/netflix_prices_going_up_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/iiGhbie/weekend_away_deals_scotland.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/giSgdhI/gem_mines_in_boone_north_carolina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://renawexit.epizy.com/94022160923.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/cle_elum_river_fishing_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2f4820-3aad-456a-9c47-cc89cf471579/tl-wr841n_v9_firmware_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e2342f-101c-4001-9b4f-ba6c5633f3ec/18652891358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8819fdcd-405c-4ce6-8caa-1aec411206bc/41414725558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ca6cf8-f241-41ff-ad76-f502dd232873/causes_of_pimples_on_forehead_and_chin.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/letter_a_worksheets_cut_and_paste.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/bapowotuso.pdfIn PDF document text
    • http://zalaxorenisev.epizy.com/balance_sheet_example_insurance_company.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/braingle_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/47377328646.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA5 5284 bytes
SHA-256: 25b6579255acc05192a9184638e16372833ccb4ea92c39ce7b5d1c75a8d63141
font_01_sfnt_off0000df8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 11840 bytes
SHA-256: 618e5bd964d0874c739a1ea6ef1c597a41cc86ddcb19b55c4d577a0fd1962541
font_02_sfnt_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 16388 bytes
SHA-256: a4f616c8ed03231f927c8f6725ddfb6aed79ba1e9c0c9257d690ec40f184d4cc

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