Malicious PDF — malware analysis report

Static analysis result for SHA-256 331b6f5446d2f69f…

MALICIOUS

PDF

81.2 KB Created: 2021-03-18 18:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8a54f8431e8a3e3527b0d9c9723ebfa1 SHA-1: 719c9e9a7d8bc731cb1caa546ae896f2e8608f72 SHA-256: 331b6f5446d2f69f71cefd2587ed971cb4999693fa6725fd57611f332561d3ac
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a notable concentration on disposable hosting and link farm characteristics, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://baarspo.ru/123?utm_term=azar+apk+indir+ios PDF link annotation
    • http://organicnu.info/sulekomapoliditolabaroc7bip.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/macbeth_test_review.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/kingdom_hearts_1._5_ps4_trophies_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_601ba80ba0947.pdfIn PDF document text
    • http://vulomufukuvi.22web.org/assamese_song_video_tinyjuke.pdfIn PDF document text
    • http://spainwow.pro/le_nouvel_allons_y_1_megolds2x3pj.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/what_comes_with_fl_studio_producer_editionstya8.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/shure_ulxp4_sm58.pdfIn PDF document text
    • http://alphabitx.com/lovetabiwozumig8hti.pdfIn PDF document text
    • http://verifybadgehelp.com/clue_the_classic_mystery_game_instructionsiowf0.pdfIn PDF document text
    • http://arbitestpark.xyz/58767687192r7kqu.pdfIn PDF document text
    • http://chambrehq.xyz/plantar_fasciitis_exercises_espanoliapf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420599/normal_604020daae044.pdfIn PDF document text
    • http://samoe-samaya.ru/3229049130090nfi.pdfIn PDF document text
    • http://wanulutipumik.iblogger.org/40165961921.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/how_to_use_casio_alarm_chrono_watch.pdfIn PDF document text
    • http://alex-chekalev.com/72422975972los4v.pdfIn PDF document text
    • http://kusuraluzi.iblogger.org/best_feats_for_death_cleric.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455375/normal_5fd7f6f78d310.pdfIn PDF document text
    • http://idealicacolumbia.site/butisica7zm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422918/normal_5fc98f4019ea1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bagabosafeko.epizy.com/jaguars_vs_saints_injury_report.pdfIn PDF document text
    • http://kateporabub.epizy.com/41976815847.pdfIn PDF document text
    • http://dulizarunagisu.epizy.com/bobbi_brown_foundation_shade_guide.pdfIn PDF document text
    • http://xeladijigaw.epizy.com/manual_de_caldeiraria_e_desenvolvimento_de_chapas.pdfIn PDF document text
    • http://faxiwig.epizy.com/74726708167.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 5024 bytes
SHA-256: c8dcc69ee95c36752b376a2d9dc0ba37811a394ef2f3e046b38aec3454a309f2
font_01_sfnt_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 11828 bytes
SHA-256: b3440691f35469dfc5861eefdb83a3f6fe6abb788950b1d9e1c741d0a0b35187
font_02_sfnt_off0001206d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206D 16076 bytes
SHA-256: e7bbf0bca74f6ba17897bef3710127efb44abcf9298e3904bb3957032cc1d2c1