Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a8f2210b838276…

MALICIOUS

PDF

79.8 KB Created: 2021-06-03 22:39:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e490590adc941796a6aae0d16d9ef8fd SHA-1: e02e63191eacff3064d08905a9323e0fe3a6bd4a SHA-256: 45a8f2210b838276859d16eb64cc91601fdcf45082c8ec91868326e1c67cec54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wastran.ru/pbw?utm_term=top+10+nba+point+scorers+all+time PDF link annotation
    • https://filuwanukolo.weebly.com/uploads/1/3/4/8/134874182/bewigune-rerazule.pdfIn PDF document text
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/tevopobafiguvaroxav.pdfIn PDF document text
    • https://rozuguki.weebly.com/uploads/1/3/0/7/130775318/putijo.pdfIn PDF document text
    • https://vimosetadasosus.weebly.com/uploads/1/3/2/7/132740377/mofomixuxut.pdfIn PDF document text
    • https://dorubirema.weebly.com/uploads/1/3/4/3/134317311/91d1a579ac34.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/90a532c5-51b2-4d1f-ab09-afaccc2d9e6e/68993187871.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144474072/q4_find_the_cube_root_of_27_64.pdfIn PDF document text
    • http://pezeliv.pbworks.com/f/crash_bandicoot_ppsspp_apk.pdfIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144486357/how_to_reset_an_xfinity_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/370d54e6-efe2-426a-86fd-2f2dbda71af3/98957445036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc0a5a4-4cfa-40d6-b035-78d2b8313a70/foxuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc8a4d64-b144-4701-97fb-6b86bc60ac8d/7312708109.pdfIn PDF document text
    • http://pejokawigar.pbworks.com/f/vatijobixawupuroxex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f8ccb77-206e-4e51-818e-1ac75bc72de4/how_to_draw_function_curved_lines_in_photoshop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1de76b25-ddf7-4abc-88ca-faaeb159beee/dantes_inferno_circles_of_hell_names.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/w/file/fetch/144505647/the_things_they_carried_chapter_14_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cc0e4d5-4d17-433e-8a0c-4418a0a5d6ec/johnny_b_goode_bass_tabs_chuck_berry.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/f/butterfly_line_drawing_images.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/w/file/fetch/144453348/characters_in_weep_not_child.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc958d3-2066-426f-aad2-40734021e31e/58289415629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe7d5a3-8e58-441c-8e9e-f86cb3551323/wisane.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/f/12735846613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd0afa6c-cfda-4f73-bc2a-83b40451336d/21663455201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0bb9330-cb42-4fc6-8bb1-b19190ab6457/19767535229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83b885d7-70a4-48fe-83bc-ca53ae729ca5/does_lowes_still_sell_troy_bilt.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_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 5364 bytes
SHA-256: be7f9966d2d7f4199b6f424af406a8b058c96c7cbb601c9a8000ec66b7b33983
font_01_sfnt_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 11520 bytes
SHA-256: 9f97fcaf7766300d6cd9f8dc83354ca2e10c85bd8028aa3f4f74cfe32b4f0241