Malicious PDF — malware analysis report

Static analysis result for SHA-256 a103ca9980dd4284…

MALICIOUS

PDF

93.5 KB Created: 2021-03-16 07:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 68a14ba3e9e2c4bb0470aed5e3bd6cc7 SHA-1: 9d3b6d55982083888556712e82a207f4b61d8f7a SHA-256: a103ca9980dd428448020a854cad0aad12f983b61fc06a51b5dbcc95f07d9bd0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/wix?keyword=don+quijote+resumen+para+ni%25C3%25B1os PDF link annotation
    • http://servempieza.site/67180397415uosvh.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/persuasive_speech_topics_information_technologyinpq1.pdfIn PDF document text
    • http://weareanonymous.org/how_to_fill_honeywell_cool_mist_humidifierai8vh.pdfIn PDF document text
    • http://fejugutafilevin.scienceontheweb.net/asus_rog_strix_z390_f_gaming_manual.pdfIn PDF document text
    • https://javagakikidubat.weebly.com/uploads/1/3/0/9/130969576/077230303fe6b7.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/katzung_pharmacology_review.pdfIn PDF document text
    • https://gigorevexi.weebly.com/uploads/1/3/4/7/134714530/xolasutoxanogoxel.pdfIn PDF document text
    • http://wopexobow.mywebcommunity.org/solutions_manual_to_accompany_linear_programming_and_network_flows.pdfIn PDF document text
    • http://flylovel.com/40713868528roknu.pdfIn PDF document text
    • http://pewekelexu.mygamesonline.org/25237698762.pdfIn PDF document text
    • https://fitejajozifidom.weebly.com/uploads/1/3/0/7/130775998/tozisigomobitov.pdfIn PDF document text
    • http://forecast.bet/baldur_s_gate_apkmaniaoyx16.pdfIn PDF document text
    • https://zaniwobomivefo.weebly.com/uploads/1/3/1/4/131406480/898dd.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/890809de-0cda-4f9f-881f-e8a75fe605ac/86197023263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc09a056-7a63-49ca-9b96-7b3d6f6d084b/dsc_neo_add_user_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f3767ee-1e9a-416b-9d05-09f2839dbbf4/john_carlton_fleming.pdfIn PDF document text
    • http://fukuselumetu.myartsonline.com/electrolux_1800w_vacuum_cleaner_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a96e27-93a0-469f-b64c-9f97ee4b4c44/vijon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93bd052d-ae8b-432b-b17f-b04256c0c924/maze_runner_2_full_movie_dual_audio_download_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e045b91-7e32-416d-a40f-66d9f4363345/how_can_i_make_money_online_in_cameroon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99684d79-0784-498c-b803-50c0e950711a/31106195538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66608310-6cad-497f-9026-0a65b5ec70fe/bosch_500_series_dishwasher_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/506b015d-6592-4cbb-811f-0dc8f02f8407/syma_x5c-1_new_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ca53f8b-29b9-41c3-9833-02f2bbc83592/rebirawaxiwutedegoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eea84b8-b2b7-4c20-ae10-232a9aaa0b97/the_exorcist_2016_season_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96fd2121-952a-4268-96c0-227f1eedcdd8/dorothy_must_die_series_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30563d75-6176-4dbf-99cf-2a473311b1ed/easy_drum_music_for_beginners.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_off00011ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBB 5228 bytes
SHA-256: 5193b02a602344e4781f74fa51c96c3103d495bcc266f0923862a534a30f67d8
font_01_sfnt_off00013025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13025 12708 bytes
SHA-256: 93aa2ba182c53c60af03f2cc791d6904724f14437ee5b973df055ce475603392
font_02_sfnt_off00015855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15855 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e