Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b99511cd65b7aa…

MALICIOUS

PDF

73.6 KB Created: 2021-06-14 15:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 42ff9fb8ce17ecde866d55cdd092c39c SHA-1: 66f1340ad2ac7331b8c6d7897e17cf3d8c657aad SHA-256: f2b99511cd65b7aae53a8f37e0ed788c33f8e85c951e82a767fd6e2cecf35bf2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to attract traffic. The primary URL, 'https://pistant.ru/pbw?utm_term=9th+class+physics+notes+pdf+free+download', is presented as a download for educational notes, a common lure. While no scripts were directly extracted, the ML classifier and link farm heuristics strongly indicate malicious intent, likely to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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://pistant.ru/pbw?utm_term=9th+class+physics+notes+pdf+free+download PDF link annotation
    • https://wotipivas.weebly.com/uploads/1/3/1/4/131482993/e6409a420.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/pimapozapajegi-garozipase.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/jesamoz.pdfIn PDF document text
    • https://nulivoji.weebly.com/uploads/1/3/4/3/134343303/e242edf619b1375.pdfIn PDF document text
    • https://kokozorakozuwel.weebly.com/uploads/1/3/0/7/130775651/kovupibe.pdfIn PDF document text
    • https://jozudepixivi.weebly.com/uploads/1/3/4/6/134682498/kofajusemodo.pdfIn PDF document text
    • https://silifasakesi.weebly.com/uploads/1/3/4/5/134510621/pakofumaxepolenopaze.pdfIn PDF document text
    • https://bafafodalub.weebly.com/uploads/1/3/4/3/134367540/7569d22.pdfIn PDF document text
    • https://wovasemuzusalej.weebly.com/uploads/1/3/1/6/131636629/vudufefebuwif_sevunazeroxox.pdfIn PDF document text
    • https://bifupepazabar.weebly.com/uploads/1/3/4/7/134740405/roziwozojatuma.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/c5cde6a6-e302-4edb-be13-9b54e68c444c/unterschied_maverick_et_732_733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117b188e-3386-4749-9ab4-357707d6a721/1947059816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36047689-7649-4cdb-aa23-48954b9072b5/cules_son_los_7_sacramentos_y_su_significado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0833fb06-addb-45f5-96b9-d31b71d92e90/40798246407.pdfIn PDF document text
    • http://saxonax.pbworks.com/w/file/fetch/144696804/al_bidaya_wan_nihaya_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27ea8db2-73b6-4888-93ad-602223c11d0c/shark_navigator_lift_away_deluxe_air_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb901232-6122-4767-a631-e154f28261a6/realidades_1_capitulo_2a_actividad_12_writing_answers.pdfIn PDF document text
    • http://raxonepem.pbworks.com/f/12093063634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b98d1e-8d97-43a7-a2e4-3a08ea13d6ef/verbos_regulares_en_ingles_pasado_simple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d57279-3f52-4208-b498-90c571bcc836/bissell_big_green_machine_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ea9e0ea-3d1e-436e-9629-4f23416c7a96/characteristics_of_domestic_tourism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a4346d-fee3-43bb-8e07-44298838fd31/andrew_wommack_teachings_2018.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/f/nixomiwituvajekerot.pdfIn PDF document text
    • http://juvudibip.pbworks.com/w/file/fetch/144864840/is_adverse_possession_legal_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/093b22f0-5f43-43ce-939f-96452e2004e6/bks_iyengar_light_on_yoga_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d17bb6c8-f02f-4f3b-bd74-f2a663b14123/sony_vaio_recovery_disc_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a846d297-c526-4092-8a50-c83aa06aa7f6/raxiwo.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_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 5496 bytes
SHA-256: 5c28dc32aad74a8eeebe5da79d6afafc152cfb357f5a95aba8c682befc2f03b6
font_01_sfnt_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 10180 bytes
SHA-256: 511daf15d739414c636839a9cbd78581cfb3b4b49b984c174a6b6af336c925ec

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