Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cd3e8d61cd6534…

MALICIOUS

PDF

74.9 KB Created: 2021-03-04 13:57:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6a3eb733dcdf0bf60ca59cb7e5b81b97 SHA-1: 84bc5e729eedb0d4b56bbc4442f98bffdd96661c SHA-256: 55cd3e8d61cd6534e0aaeab81f4ac0c5c977ea4f3def1a2332e5b4fad1427e41
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one specifically appearing as a search result for 'how to connect philips bluetooth headphones shb3060', suggesting a social engineering lure. The presence of external URIs and a link farm heuristic further supports the malicious intent of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/wb?keyword=how%20to%20connect%20philips%20bluetooth%20headphones%20shb3060 PDF link annotation
    • https://cdn.sqhk.co/nuxezitowefi/dfT5haz/battle_royale_3d_warrior63_63_apk_download_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_6030286bd28ee.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/b7iiif7/hd_wallpapers_1080p_iphone.pdfIn PDF document text
    • http://blancly.xyz/87798786472uccmu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_603fadde77c17.pdfIn PDF document text
    • http://ighelpcenter.xyz/personajes_principales_de_la_obra_el_caballero_dela_armadura_oxidadatoj76.pdfIn PDF document text
    • http://kellys.space/siputunasususoji635iw.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/ijPkZhj/dasofuwivo.pdfIn PDF document text
    • https://cdn.sqhk.co/nalujujoso/ahcIigt/hungry_dragon_richmond_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/hbhbham/lolavo.pdfIn PDF document text
    • http://mabay.fun/the_lion_the_witch_and_the_wardrobe_summary_chapter_8ub8u9.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/007bf197-ac76-4b52-b1bc-2d516a6112d4/big_fish_market_rehoboth_thanksgiving.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/michelin_guide_2020_washington_dc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e15ad1e0-39f0-4e2b-8f8e-1a96a171fdaf/how_to_improve_mobile_coverage_at_home.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/avengers_assemble_cartoon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1178276c-4e33-4b50-baea-e5f4ff6b0c0d/shadowhunters_the_mortal_instruments_cast_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fdf9ec8-7c71-49e1-ba06-37e7e9da9f26/9102331140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2432594-0970-4d25-9874-eda70923defa/where_is_the_connect_button_on_logitech_k520_keyboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24bc2cfd-443a-4d70-9d18-a7f0f10851ee/dozelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7daa4d7c-6a7d-4acc-a14a-f7cfc3eac895/sims_3_sunset_valley_best_house.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/population_ecology_homework_study_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8bc2fcd-092b-4c96-b950-2acdf49f02f0/schlage_s480_digital_lock_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d392c14a-282a-4c37-8900-83babb0dbc75/victrola_turntable_stopped_spinning.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_off0000e1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EE 5720 bytes
SHA-256: 9edf8a9e8030dc695ae152903f66f17488cfb3cf737c1ac3208426fd364434e4
font_01_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 12120 bytes
SHA-256: 2001a728a20c55b5c7649280711f3ca9a5d27e8ee0b787ccb4bc16978ed48497