Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1136da62dfd7e2…

MALICIOUS

PDF

74.7 KB Created: 2021-06-12 18:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6fd3a05affab94a1f93409d572bd1230 SHA-1: a9bbd59d218cdecc89a657d4bf866a38dab83c88 SHA-256: 4a1136da62dfd7e23cdd30641687ca3e7aabcfb343057547379f825533d29436
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 'nomylo.ru', identified as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

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://nomylo.ru/pbw?utm_term=wizarding+world+quiz+house+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477387/normal_6039681a85580.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4418365/normal_60b67d47e02a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_606d28d2ac79f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494417/normal_6024c2111a3b3.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/b3d9d3aa-f55e-4bb6-be45-4c43a2df21c0/court_of_thorns_and_roses_paperback.pdfIn PDF document text
    • http://vejivab.pbworks.com/f/mxq_pro_firmware_7.1.2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0bada78-24fd-4f3d-9893-79082b2c08be/firasazuxibiferu.pdfIn PDF document text
    • http://gezebal.pbworks.com/w/file/fetch/144806346/how_to_connect_my_ge_universal_remote.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/w/file/fetch/144465387/everyday_spelling_grade_6_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d5e5c0-6749-46b4-bb0a-3f800eecf764/rofilitarupudateloge.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/w/file/fetch/144677583/ramayanam_story_book_in_tamil_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5f70fa-3a6a-499e-8ec1-853baf0521d3/casio_databank_calculator_watch_manual.pdfIn PDF document text
    • http://paditoxef.pbworks.com/f/tmi_island_song_sheet_music.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/f/fotos_del_juego_ponle_la_cola_al_burro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b289446d-f816-47a6-a97b-493dfe36ec1e/sword_art_online_light_novel_english_read_online.pdfIn PDF document text
    • http://kepojijudiva.pbworks.com/w/file/fetch/144564207/fafunevomok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e5a3e0d-0b74-4a76-90a3-af32b375308c/html5_textarea_input.pdfIn PDF document text
    • http://kenoxipej.pbworks.com/f/39792440771.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/psiphon_pro_mod_ios.pdfIn PDF document text
    • http://risoxef.pbworks.com/f/vikasopiwozij.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_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 5368 bytes
SHA-256: a8c6f26b4a66a588e8da767c6a952d1e55c218a4c6e378478ee251c56de621d1
font_01_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 10776 bytes
SHA-256: 195e7e550b7957f22eb3f9655f1853f2e748ac111f42063e2e3d261b1f8b65ab

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