Malicious PDF — malware analysis report

Static analysis result for SHA-256 8540aa4f277de7af…

MALICIOUS

PDF

91.1 KB Created: 2021-02-16 12:39:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b09a73360b3499143cf4c9678bc130e2 SHA-1: 595588f65f1f274146f225b014d2c85250ed1f64 SHA-256: 8540aa4f277de7af770cfc435fa6dff0d42927ff83be030f49abdfa2eda8aa61
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9988

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://baarspo.ru/wix?keyword=gta+san+andreas+apk+mediaf%25C4%25B1re+modificado PDF link annotation
    • https://cdn.sqhk.co/zofizitene/vhdb4oh/odyssey_animal_companion.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496584/normal_5fc6dbe53eb0b.pdfIn PDF document text
    • http://managerprogram.live/no_continente_europeu_uma_linha_frreaqhx6c.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/kerala_weather_report_liveps1ow.pdfIn PDF document text
    • http://wopivobozas.66ghz.com/boss_2_movie_song_mp4.pdfIn PDF document text
    • http://italy50wow.pro/manual_del_aprendiz_de_cocinerolbcs3.pdfIn PDF document text
    • http://salestore.pro/thermodynamics_notes_mit9f3ir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412897/normal_5fcd8e8581356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471275/normal_5fe5ba796948b.pdfIn PDF document text
    • https://cdn.sqhk.co/dawadetugas/hemsSfr/khan_academy_eureka_math_7th_grade.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/32801073288bh884.pdfIn PDF document text
    • http://sewonmedix.ru/tejelabaxatilidify94um.pdfIn PDF document text
    • https://cdn.sqhk.co/jakabapewuv/XU27Yru/shelter_cove_campground_for_sale.pdfIn PDF document text
    • http://lumacy.site/numerical_analysis_sauer05dzm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495265/normal_60183874a2860.pdfIn PDF document text
    • http://alisaborodaenko.design/zuzinokogmq0z1.pdfIn PDF document text
    • http://tuimag.ru/morrowind_prophecies_game_of_the_year_edition6lp7i.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
    • http://tijiwef.epizy.com/bye_bye_man_imdb_parents_guide.pdfIn PDF document text
    • http://godolefimew.epizy.com/katowuliginofitogudali.pdfIn PDF document text
    • http://kamaxunavag.epizy.com/17685529917.pdfIn PDF document text
    • http://xutulatovemi.epizy.com/walotasinozas.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 5184 bytes
SHA-256: 71b95550935e2e750a72aed8eab33d702e0b2a89731e14675a2bd6f408588b11
font_01_sfnt_off00010608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 2140 bytes
SHA-256: fa98316bad0ee393e4244be63b1d230beb4724cf855be96ad4f2c87a5b302ae2
font_02_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 12252 bytes
SHA-256: 2a6bafabe6ed5d83dd3a8f9e997b94195b6d8f6609380ac6337de28dc6b85aea
font_03_sfnt_off00013786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13786 16316 bytes
SHA-256: 8084185a6d0dd841e6a8e7f4618a18907baec685aee5eef808b3d5298eec42d3
font_04_sfnt_off00014d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D15 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3