Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f58c84a2a2a496e…

MALICIOUS

PDF

80.0 KB Created: 2021-01-27 11:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7c4a4458ecd5540f377f3dd1df0dcaa7 SHA-1: f2c39bdc4737fb10362288415cab1635f50ca2ac SHA-256: 8f58c84a2a2a496e7daa5654117efa2a4e6f704a4ac507e9560891ccbfc53244
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple external URIs, including one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to a musical script, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://leonvi.ru/123?utm_term=footloose+musical+script+pdf PDF link annotation
    • http://koprovk.xyz/tsotsi_grade_11_book_summaryrohka.pdfIn PDF document text
    • http://akvatehnika74.ru/flying_dragon_robot_simulator_transformation_war_mod_apkggxby.pdfIn PDF document text
    • http://fitness1.space/bird_box_trailer_17f03m.pdfIn PDF document text
    • http://tradebot.space/final_fate_td_ios_release_datetura2.pdfIn PDF document text
    • http://fitdieta.com/ez_reload_terminatej56pq.pdfIn PDF document text
    • http://tricitysikhs.com/ninja_kiwi_btd4_expansionw2ut2.pdfIn PDF document text
    • http://lovelid.xyz/150586572623sdb8.pdfIn PDF document text
    • http://onsideball.info/besajowezebije8ks51.pdfIn PDF document text
    • http://ropukejak.22web.org/44527757140.pdfIn PDF document text
    • http://velavedi.iblogger.org/95923662958.pdfIn PDF document text
    • http://shoop-fn.ru/red_slug_bug_for_sale4rk24.pdfIn PDF document text
    • http://shoop-fm.ru/rekevituxukepanudejamsrlm6.pdfIn PDF document text
    • http://savadaqwe.space/fefijaxixixibumu9cslq.pdfIn PDF document text
    • http://weinmvc.net/the_cw_2020-_213u32t.pdfIn PDF document text
    • http://classicalnaturally.com/archeage_fov_moddm4hg.pdfIn PDF document text
    • http://websecurer.tech/arminianismo_a_mecanica_da_salvao_minhatecavbof1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vetuvadoxawiton.epizy.com/gmp_annex_15_deutsch.pdfIn PDF document text
    • http://mibesajaku.epizy.com/gastric_bypass_pre_op_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/40848702121.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/83185944405.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/beat_it_remix_ringtone.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_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 5256 bytes
SHA-256: 8ecde95fa3a7bad4aaf69007741915a6c29efaca1dc9e76e1f11e383e3ea7227
font_01_sfnt_off00010bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB1 11876 bytes
SHA-256: 650d2832190e6bf16b31bf4fe332a87fdea4f161f4d73ab41b5b6ff5c9e5c4c1

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