Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cc1cf4ec234c87…

MALICIOUS

PDF

84.4 KB Created: 2021-04-07 00:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 755d1775542b07d0e11fd34a040cc780 SHA-1: ef3ebbf77b8fb0359140f74e24c135ec3ffe5669 SHA-256: 77cc1cf4ec234c87961fb358674860a1452d81e176ea91754e522ed6dc3b1cd6
126 Risk Score

Malware Insights

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

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains multiple external URIs, with a primary suspicious URL leading to a site offering an image-to-PDF conversion tool, which is a common lure for phishing or malware delivery. The PDF also exhibits characteristics of a link farm on disposable hosting, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/award?keyword=ph%25E1%25BA%25A7n+m%25E1%25BB%2581m+chuy%25E1%25BB%2583n+t%25E1%25BB%25AB+h%25C3%25ACnh+%25E1%25BA%25A3nh+sang+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392191/normal_5feffa4d63254.pdfIn PDF document text
    • http://rabizepafuxonag.mypressonline.com/definition_of_development_by_world_bank.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/hea8Bij/vanajobejagakodafaralu.pdfIn PDF document text
    • http://santaparker.store/my_explorer_wont_startydfq2.pdfIn PDF document text
    • http://vinnipoh.fun/xawidukutaxadijpxcc9.pdfIn PDF document text
    • https://cdn.sqhk.co/jafakitiw/iagciiu/final_fantasy_explorers_dragoon_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449012/normal_603aab235c426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_6031030ee5b68.pdfIn PDF document text
    • http://ins.expert/nezejavulugimaruvatoxemif24oi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_605abd62183b4.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/universal_studios_hollywood_map_2020.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/aafd953d-73f1-40ee-8822-dd2a6a0b78f1/boxititetadanopijitani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6caccd0-f712-4211-9485-8a97699c3ab6/8_parts_of_speech_with_meaning_and_examples_brainly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23e31f78-3865-482f-9357-385abc8ece35/nixplay_nix_digital_photo_frame_8-inch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed9c5d12-9897-47e3-9806-cf24b5399d76/is_cissp_worth_it_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7339d12b-e5b0-4815-8c68-900bfad4bfb7/annie_the_musical_script_and_lyrics_2014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1bc3cd7-c9d5-4b70-98d8-9b7dc9e65e40/gupizijiwomozipumiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8e034a1-be3c-4cf9-8b63-367ba6606db4/32214510719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6007ed21-6d9d-42f2-b84b-80dc2b7cd87f/75064909721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c23bf3d5-e308-4b06-bc86-43e587d51409/xezowupuzadiwinasagenev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd1f0d0b-2a79-4334-93af-23572f8e7027/clasificar_los_numeros_enteros_racionales_e_irracionales.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_off0000e5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 6660 bytes
SHA-256: bd7ea3dbdce0c7ac2e33d1ffa957677063824733a50f0cc446d42274f386b37f
font_01_sfnt_off0000fa6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6D 22368 bytes
SHA-256: c175e26534e07e438916637195bc7bcc94c0d1ffd387b28293151bb25643ea54
font_02_sfnt_off00012c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2B 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501