Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bed9325551bcc47…

MALICIOUS

PDF

82.7 KB Created: 2021-04-30 23:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 858ef7a47f460d096a43cf4a5c3808d9 SHA-1: fa33bce0def02897ccedbb5ffaf7959143cd3fdf SHA-256: 4bed9325551bcc47f3703509ade8667819ed932c91dbbe08015c32946fb6b241
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://golowaki.ru/strik?utm_term=how+many+quarts+of+transmission+fluid+does+a+2007+nissan+murano+take PDF link annotation
    • https://cdn.sqhk.co/pelebitebi/4phfMXA/dragon_ball_z_dokkan_battle_apkpure.pdfIn PDF document text
    • http://mavixepajifulem.scienceontheweb.net/centrales_termoelctricas_de_biomasa_libro.pdfIn PDF document text
    • https://dafavazama.weebly.com/uploads/1/3/4/8/134893815/rilok_monotufesuzezit_ritelu_lisefaluw.pdfIn PDF document text
    • https://cdn.sqhk.co/zedawuzijis/hajbhD7/18388049962.pdfIn PDF document text
    • http://roxifij.22web.org/descriptive_method_of_data_analysis.pdfIn PDF document text
    • https://jorosavuzeloda.weebly.com/uploads/1/3/4/7/134755790/404bd.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/hhif1Mo/how_to_make_origami_flower_using_money.pdfIn PDF document text
    • http://damenetapep.iblogger.org/nitirabuduzajiwu.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/fusavof.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/hjnljeR/electrician_apprenticeship_jobs_northern_ireland.pdfIn PDF document text
    • https://jaxefosizi.weebly.com/uploads/1/3/6/0/136083017/guxipopezakuxito.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gafodix.myartsonline.com/password_protect_adobe_reader_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24222ce6-beb0-427a-acfe-6537fa592158/how_many_pages_is_a_connecticut_yankee_in_king_arthurs_court.pdfIn PDF document text
    • http://regujivabi.rf.gd/23732103158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a5f3e3-8372-4da1-acb9-2e3baff37971/bilumixoriwid.pdfIn PDF document text
    • http://minuwugonobusuw.epizy.com/ruwid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f59dff-ffeb-43bf-ad49-05cf6c7d63a7/nefejoxuradevuvexeroman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/276e60f0-417d-4e0a-be6b-d4091fa6c0d7/why_is_my_lg_ice_maker_not_dumping_ice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd7db7f-c97d-45a4-8dd1-3c1c84b5e169/when_did_the_great_depression_end_in_canada.pdfIn PDF document text
    • http://xebowuruno.epizy.com/89996606415.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/how_do_i_update_my_garmin_nuvi_2595_gps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc85c7c-d4b9-474e-a0c0-0e6105a076cc/apple_ipod_shuffle_charging_dock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b00e2602-c8ff-42f7-8c28-2353bb713f44/what_is_a_tropical_monsoon_climate.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB77 5752 bytes
SHA-256: ba970d73be1111680c2cfe1fcc7dbcde226b50062f9cf95ca2a2b239fb30afb1
font_01_sfnt_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 11308 bytes
SHA-256: 8f2387817bd0ceecac13f5e69bd34eddd68641213f92d4a3bd49272efb994863
font_02_sfnt_off000125fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FA 16416 bytes
SHA-256: e1b2b4688557f53d7bb3b0cae3646c5c298247c7f5722a4b8c84b67043f591e1