Malicious PDF — malware analysis report

Static analysis result for SHA-256 af954277c24c1176…

MALICIOUS

PDF

73.5 KB Created: 2021-03-05 10:32:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ef2157f30a3ffdfe45202b2142f4f148 SHA-1: 2059bf634bf907f6e349a6698d97946255654d02 SHA-256: af954277c24c11766fcf2075119941a7e3e7faf25e3ef5e74009daf3bfdce68c
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jacksth.ru/strik?utm_term=reaccion+de+combustion+del+buteno PDF link annotation
    • https://jotavitot.weebly.com/uploads/1/3/0/7/130738821/saverurajasuvu.pdfIn PDF document text
    • http://lami-lashes.site/corte_de_cabelo_em_capas_e_degrafilakgcw3.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/how_to_program_my_ge_universal_remote_to_my_dvd_player.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/dmejiCi/reforelelanisexibi.pdfIn PDF document text
    • https://mizefowoxeze.weebly.com/uploads/1/3/4/4/134485365/5058919.pdfIn PDF document text
    • https://cdn.sqhk.co/felolavap/XieF0jj/houstone_tango_blast_gangland.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/gcLjehb/cafe_racer_leather_jacket_suede.pdfIn PDF document text
    • https://cdn.sqhk.co/joremeve/ighaBhi/km_video_player_pro_apk_download.pdfIn PDF document text
    • http://mnclassis.org/anodized_aluminum_sheet_cut_to_sizentvkh.pdfIn PDF document text
    • https://dixosejut.weebly.com/uploads/1/3/1/8/131857981/poworuj-xapixemakafob-sizize.pdfIn PDF document text
    • http://businesslinecenter.com/poberixemuxekogesixoruq3hb9.pdfIn PDF document text
    • http://copytoshka.ru/xanowejiwazeqyj.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/7283962.pdfIn PDF document text
    • https://cdn.sqhk.co/bemovunilupo/ib4iijd/xtreme_drift_2_apk_hile_indir.pdfIn PDF document text
    • https://cdn.sqhk.co/linotepibubi/Qigt3ih/hack_para_guitar_flash_2019.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/swamp_attack_cheats_free_downloade5dl4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupuzawov.onlinewebshop.net/multiplication_sums_for_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/casino_1995_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/sinegiduvuximodogogox.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_off0000dd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 5136 bytes
SHA-256: 37324c2f5b8d649b5d64f2bc7cba1813ae28b35e0d9d0b6aa71723839e74e7b4
font_01_sfnt_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 12380 bytes
SHA-256: e337563cd364dc19efbd4db493c80a26e86d4cd1f402d8f1fe4a40c53e3dd177

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