Malicious PDF — malware analysis report

Static analysis result for SHA-256 6764f541abebff9e…

MALICIOUS

PDF

82.8 KB Created: 2021-03-17 23:17:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: aa162da9203fb56766cd45201d393ea3 SHA-1: 273c48a1375bd5df1cc992ced78e362bfb9fd7c3 SHA-256: 6764f541abebff9ee7549b9adffd5b0c119ac559da3070c5cebc22e4b558e0d4
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as 'https://druttle.ru/award?keyword=alexandrina+maria+da+costa+pdf' and 'http://msertis.xyz/sawewofozufafebajidopozp0fl.pdf', are likely used to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/award?keyword=alexandrina+maria+da+costa+pdf PDF link annotation
    • http://msertis.xyz/sawewofozufafebajidopozp0fl.pdfIn PDF document text
    • http://emmetrix.net/360806397810042x.pdfIn PDF document text
    • http://smm-target.ru/verisina65gzv.pdfIn PDF document text
    • http://antileqphh.site/refraction_of_light_download_class_11g59y9.pdfIn PDF document text
    • http://adminhalil.com/how_to_breathe_during_gymp5n26.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/wajurotelabixozuzawatofush16r.pdfIn PDF document text
    • http://gachihyper.xyz/29265015482kjvp6.pdfIn PDF document text
    • http://palitra-cveta.ru/amadas_peanut_combine_parts_manualgufod.pdfIn PDF document text
    • http://0fruit.space/febovuxovxsvlo.pdfIn PDF document text
    • http://ekzo-fruit.ru/kovifbt4hx.pdfIn PDF document text
    • http://pay-order.info/troy-bilt_pony_42_7_speed_547cc_lawn_tractoryg3jd.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/a24a9683-c6f0-4b4e-8c6f-85f18326fcaa/the_cask_of_amontillado_plot_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e43a9d9-8bd6-4015-8cb6-9f4b754db16a/craftsman_18_gauge_brad_nailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6243793c-237f-4c44-9050-884bc5312dc6/plantronics_backbeat_fit_3200_in-ear_true_wireless_sport_headphones_teal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10acf055-a8a5-4f92-9c9a-6966b44a0dd8/examples_of_professional_development_goals_for_case_managers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b4e9ce2-576e-469d-816d-873ab497c72d/trigonometra_y_geometra_analtica_michael_sullivan_ejercicios_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61ac97f6-5095-407e-973d-7ad965f2a679/fokejidiguk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa6cbf6-0c36-41d6-a741-fe853574cf73/90968176742.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/def05401-531e-4a18-9608-299464dfb256/ralph_p._grimaldi_discrete_and_combinatorial_mathematics_5th_edition_pearson_education._2004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abebe1f0-9795-43a8-a6bf-0994ff46bf85/how_to_connect_bose_wave_radio_to_samsung_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d88b08e9-91c1-4f9f-881c-1003c612e964/the_power_of_love_song_lyrics_frankie_goes_to_hollywood.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_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 5148 bytes
SHA-256: d77caa27f81b01743f6ef110fe2a5e6f8c6638b2878cbb9781ceb92946e3d7ab
font_01_sfnt_off00010ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 10996 bytes
SHA-256: 58eac97df8a3ace8f4ebf54c8ced3e4756568511813dd7b8249f5e308afcae1b
font_02_sfnt_off00012f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F94 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c