Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4b1d6617a76482…

MALICIOUS

PDF

153.1 KB Created: 2021-04-05 12:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aac8e3ec8f90673fd096ffd09bbe7b2f SHA-1: 7e756f7f7a6098df876d3176c9504d1e06448117 SHA-256: 8d4b1d6617a764820f9ca593fab1ba2e3ec9c8abe3a7f914ccea71ef0153d3a7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary suspicious URL pointing to 'baarspo.ru'. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://baarspo.ru/award?keyword=buderus+gb142+45+pdf PDF link annotation
    • http://vuwubuwo.22web.org/transistor_jfet_2n3370_datasheet.pdfIn PDF document text
    • http://minomesiguziv.22web.org/python_3.4_tutorial_download_in_hindi.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/10981804439.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
    • https://uploads.strikinglycdn.com/files/dc88b533-c387-4aaa-839f-cfed18697346/jufagogejegan.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/magisterium_4_espaol_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3da1d466-2fd9-44aa-aba7-58bef0921495/27790692284.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/dodafaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afcf17c2-3cea-49f7-ad71-06eb50a403ab/what_are_the_best_things_at_taco_bell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a4ef9f-d1a8-4958-9cd5-db0bdc3540f0/lapemilozad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86ae99b0-2411-4b0d-b77e-f9562b2ff339/42686702666.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/sri_medha_suktam_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9712f38-8d0f-49af-8888-c0a294ac9990/jiluvew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab7c42a6-efca-49a1-b2d8-be080d633ed8/mind_over_matter_lyrics_38_spesh.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/how_to_sketch_a_realistic_rose_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74fb2ad4-432b-4a6c-a40e-49837b97208f/beethoven_sonata_no_5_op_10_no_1_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64497803-56fc-423f-95b9-f5f32ae1310c/a_peoples_history_of_american_empire_download.pdfIn PDF document text
    • http://timagugovoxo.onlinewebshop.net/ansi_c_full_book_free_download.pdfIn PDF document text
    • http://norilonabu.epizy.com/oracle._spatial._geometry._jgeometry_jar_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbae8d36-8e1c-488a-aa27-98a27794433a/ipega_9023_not_working_on_ios.pdfIn PDF document text
    • http://peregal.epizy.com/abox_a2_manual.pdfIn PDF document text
    • http://dajomezivurisal.epizy.com/how_to_use_a_miter_box_to_cut_baseboards.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_off00020d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D05 5092 bytes
SHA-256: 1d26de6db1a92198e99b0419de19f89f92f6a0a9d96f4fc50e3e95de7892fd0b
font_01_sfnt_off00021e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E61 11976 bytes
SHA-256: 5040e56907b2ae7ca0142c8bf97025264ee20b5e0a2154af002c51e58c77ea5c
font_02_sfnt_off0002471c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2471C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c