Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7450d981611e5e5…

MALICIOUS

PDF

73.9 KB Created: 2021-03-19 17:19:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 82959cb16cfec9bd4fa20099d1b483c1 SHA-1: e84dfa1f0831996e0bcb114a2496d5c6c07d4ff9 SHA-256: c7450d981611e5e57f6aebd73e176b7f8fba4950f30cfb58301daeed84690d6b
166 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified suspicious links, including an invisible link to 'loginwithfb.site', suggesting a phishing or malware distribution lure. The document body, though truncated, mentions 'Ktm 990 smt user manual', likely a pretext to entice users to click the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jacksth.ru/strik?utm_term=ktm+990+smt+user+manual PDF link annotation
    • http://my-credit.info/87041373201aer64.pdfIn PDF document text
    • http://qupieasy.online/lilerifuvetekekzm2e9.pdfIn PDF document text
    • http://womarerawona.iblogger.org/james_blake_assume_form_lp.pdfIn PDF document text
    • http://naturebiolog.space/47030274612yfm3k.pdfIn PDF document text
    • http://loginwithfb.site/boot_camp_fitnessfwhhc.pdfIn PDF document text
    • http://biweekamnf.com/elementary_information_security_2nd_editionxofql.pdfIn PDF document text
    • http://misirabul.22web.org/on_the_balance_sheet_retained_earnings_represents.pdfIn PDF document text
    • http://hurricane1.space/new_animated_movies_2019_listxjdrn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mipatupi.epizy.com/plan_de_estudios_2011_guia_para_el_maestro_quinto_grado.pdfIn PDF document text
    • http://zorogeloma.epizy.com/spandana_application_form_ap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a2f72f8-37ca-4482-89c7-d486b0768a2b/luzanemeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df075045-1623-4446-a5a1-49884555a565/what_is_the_book_blue_like_jazz_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be41389d-3ac5-461c-9d4f-225bf9bfc0d7/how_to_change_date_on_citizen_eco_drive_wr200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bddc5de-6b84-4cdc-ad1f-23d8a732b506/topuluruwepifad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb327f7-97d9-4da4-925b-a60e682480ad/mobupugapugasediwasajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/927f7e14-de52-45a3-bcf4-c05a8354ef00/21_irrefutable_laws_of_leadership_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9288d59c-40b4-4c40-964d-5d46fe70856c/human_geography_autonomy_definition_of_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64343ec7-f6d7-4d6b-9a61-a4cdfebb26fc/livewire_ts_6.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/896ea902-39b0-48a5-91b9-c13ed13c70e2/25097672604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d1ead37-d0d4-4ee9-ab5c-d59465eda4c5/debarofogipojowevebovenit.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_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 5096 bytes
SHA-256: 8718f5fa43ed9f65b0a1c4b0dd00d8a43f759d98fe2141831e2d114ceafbc375
font_01_sfnt_off0000f2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 11192 bytes
SHA-256: 7918fa1cc9c1770dc289190a4f2cf8e5623d918129aef568e8b00530d787b685