Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d87b4bbf303ac8…

MALICIOUS

PDF

77.6 KB Created: 2021-04-25 12:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5d0c45b74730798cf259b66f8926904c SHA-1: a1354ad8baaa4dafe4dc565a3292b6556705d1f9 SHA-256: e6d87b4bbf303ac815a79b3af55a4e6e9749becc655671a817369ebac9b2f232
136 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an external URI and an SEO redirector link, indicating a phishing lure disguised as a definition or download. The presence of embedded URLs suggests the document is designed to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/strik?utm_term=hermeneutics+biblical+definition PDF link annotation
    • http://itagreen.fun/how_r_u_feeling_answerezfg8.pdfIn PDF document text
    • https://cdn.sqhk.co/fonixoligem/iiqyWAm/99482011085.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/gehjihj/kefipizufojefex.pdfIn PDF document text
    • http://rakajipof.22web.org/48387585776.pdfIn PDF document text
    • http://mnclassis.org/ge_over_the_range_microwave_charcoal_filter_kit0wham.pdfIn PDF document text
    • http://modezewop.mygamesonline.org/adobe_lightroom_tutorial_book.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/fusionner_des_avec_adobe_reader.pdfIn PDF document text
    • http://ourfanz.com/la_ciudad_y_los_perros_personajes_descripcion82jx6.pdfIn PDF document text
    • https://cdn.sqhk.co/sajixobuko/hVHhicV/outliers_book_chapter_1_summary.pdfIn PDF document text
    • http://kegetisa.mygamesonline.org/bonnaroo_2020_schedule.pdfIn PDF document text
    • http://tells.fun/chopin_ballade_no_4_sheet_musicufh3k.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/NSha6je/dino_t_rex_game_high_score.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/jczjdjg/pets_runner_game_farm_simulator.pdfIn PDF document text
    • http://woxupepij.iblogger.org/metformin_er_osmotic_1000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/used_chevy_cruze_diesel_manual_transmission.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/fender_mustang_2_amplifier_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/how_fast_can_a_dodge_challenger_go_from_0_to_60.pdfIn PDF document text
    • http://zewudopufe.epizy.com/how_to_remove_battery_from_petsafe_collar.pdfIn PDF document text
    • http://xemunebo.atwebpages.com/sell_old_law_books_uk.pdfIn PDF document text
    • http://rozatibex.rf.gd/maytag_centennial_commercial_technology_washer_and_dryer_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/run_android_apps_on_macbook.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/intracranial_hemorrhage_treatment_guidelines.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_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 5268 bytes
SHA-256: ee38cd9d4995980a346bc73fef8c947d88fca9c89efe8544764f5e5001efb56b
font_01_sfnt_off0001037b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 11068 bytes
SHA-256: 9bfb5da3f3b38f555cc3e5023bbcfc40602500febc1916ab6e4a918d361ce446