Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b991f3b4a6c408…

MALICIOUS

PDF

73.4 KB Created: 2021-03-06 06:55:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1dc5b8941debaea23ad5537f90ed803a SHA-1: c9edfd3f797695d58d58b5da715c8f68a9fc25c9 SHA-256: e3b991f3b4a6c4089679b5bf6d9cfe4e1a72b8d433e5c3f895072b76e739e2ed
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=how+to+beat+the+labyrinth+in+goat+simulator PDF link annotation
    • https://xakebugus.weebly.com/uploads/1/3/4/0/134018628/79c93c799.pdfIn PDF document text
    • https://gilawidukawopux.weebly.com/uploads/1/3/2/7/132741225/wukuzixazilarix.pdfIn PDF document text
    • http://vudasuti.mygamesonline.org/letepenofarituboja.pdfIn PDF document text
    • https://lemagijazifar.weebly.com/uploads/1/3/2/7/132710763/978200.pdfIn PDF document text
    • http://monufovaxuj.66ghz.com/dilbar_song_full_hd_video_free.pdfIn PDF document text
    • https://sadejakudabad.weebly.com/uploads/1/3/5/9/135965210/lafasiketope.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/how_to_draw_out_a_blackhead_in_your_ear.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/49356833209.pdfIn PDF document text
    • https://feziriwavejoli.weebly.com/uploads/1/3/4/0/134096108/razobumitutejazuliv.pdfIn PDF document text
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/rekudezefet_tezelido_simag_nemogudazewobi.pdfIn PDF document text
    • https://rakatifuz.weebly.com/uploads/1/3/5/9/135964199/3923722.pdfIn PDF document text
    • http://mirumumavetifun.mypressonline.com/descargar_musica_de_antony_santos_mix.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/sibaxadoxerimiwugev.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
    • http://taxowojo.epizy.com/vomazivobujufino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc1dcc5-2e60-4788-92d8-79afaf6d58af/cazadores_de_sombras_resumen_por_capitulos.pdfIn PDF document text
    • http://rasunafosav.epizy.com/run_multiple_android_emulators_android_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acbfe1e2-a1eb-40a6-b124-ad6068715933/what_is_the_magnitude_of_the_frictional_force_between.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9412cfbc-3d67-4ad3-a2dd-9fff407ccb8b/how_does_an_outboard_primer_bulb_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a26d9e-d24d-4edb-9e11-61e38f7ec156/list_of_connectors_in_english_and_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0396765-1b64-4a6b-99f2-a67f605b6988/30110320459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a41cc6f8-c4c6-46d2-a0d0-4aaa6fa13f7f/york_exercise_bike_display_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/462634ad-3827-4f49-b6fc-7ed116975714/stand_by_me_movie_song_lyrics.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_off0000d494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD494 5276 bytes
SHA-256: 23d8ab76a7bd7e41c0e8f07b02289e92fc4073e899ab2122126bd5e0ec5cb117
font_01_sfnt_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 10412 bytes
SHA-256: 17062246db07bf0f3b4889908260ea79e17ca676b2a40641bce370719ce85c8d
font_02_sfnt_off000109f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F8 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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