Malicious PDF — malware analysis report

Static analysis result for SHA-256 fabb26770468bb2d…

MALICIOUS

PDF

78.8 KB Created: 2021-03-19 20:22:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9b25d174e7f67ad0d06a1e2ccaac4b0b SHA-1: a47a49edcefa78a3f496574de6ce62c12da4e0a9 SHA-256: fabb26770468bb2d688d7d62dc1115a00089a3bf5e2d5e50a2f2fc0433a9f161
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest an attempt to exploit PDF vulnerabilities or deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/123?utm_term=work+schedule+template+pdf+free PDF link annotation
    • http://universe1.space/best_floor_cleaner_to_use_with_steam_mopgkgbg.pdfIn PDF document text
    • http://nefuwumimo.iblogger.org/banefofusofejexedezalebi.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/62666075405.pdfIn PDF document text
    • http://lobikekifeviwo.iblogger.org/76286277416.pdfIn PDF document text
    • http://jigatinapa.22web.org/antenna_tv_channel_guide_chicago.pdfIn PDF document text
    • http://besiditiduw.22web.org/what_states_have_palmetto_bugs.pdfIn PDF document text
    • http://magnitoli-2ekran.site/system_verilog_verification_interview_questions_and_answers8a4y7.pdfIn PDF document text
    • http://numulul.mygamesonline.org/gukomakakika.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/rapawop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://getakufo.epizy.com/8_ball_pool_rewards.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/fupekolitagelakuxeg.pdfIn PDF document text
    • http://pegufokaki.epizy.com/autumn_leaves_classical_guitar_sheet_music.pdfIn PDF document text
    • http://tafoboverel.epizy.com/biugo_app_apk_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/bhagwan_ke_bhakti_gana.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/adv_informatica_cif.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/niragobidufodix.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/ashes_cricket_game_apk.pdfIn PDF document text
    • http://totoxosogazu.rf.gd/after_great_pain_a_formal_feeling_comes_summary.pdfIn PDF document text
    • http://jidojig.epizy.com/fedex_waybill_form_for_ground.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/13799735800.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_off0000f6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FA 5472 bytes
SHA-256: 3c9d533716983d9d81bed63a88737fa26f2863a547c9ad9fd05249c64a82e7cd
font_01_sfnt_off0001097c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 10788 bytes
SHA-256: 06d6fd0b2012854c26408dc5fe1ecc8e652db09e87ffd08bd6a127d5c8dd8be9

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