Malicious PDF — malware analysis report

Static analysis result for SHA-256 3316aaa4cbf6f66b…

MALICIOUS

PDF

87.8 KB Created: 2021-03-30 06:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11939a084268bd689b71c24914ce5637 SHA-1: d48405906e41d08c870d01e3380ba53e110882c6 SHA-256: 3316aaa4cbf6f66bdf597835fb9de1c5644457d8d8dbdfd9021933145d8b0306
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. The document body, though heavily obfuscated, contains a quiz title suggesting a lure. The presence of multiple external URLs, including one identified as a potential phishing attempt, further supports this. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may contain embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://resalured.ru/strik?utm_term=harry+potter+hardest+quiz+questions
    • http://avto-trokot.xyz/5_day_bodybuilding_workout_planhcglo.pdf
    • https://cdn.sqhk.co/wunokebewoz/achinig/evil_zone_wikipedia.pdf
    • https://cdn-cms.f-static.net/uploads/4419820/normal_6031861c42524.pdf
    • http://vk-settings-change.online/entrepreneur_skills_ppt_slidesharerki9r.pdf
    • https://cdn.sqhk.co/nawiwola/jEgV6bV/baditujupog.pdf
    • http://good-production9.site/guardian_drama_vostfrrlct8.pdf
    • https://cdn.sqhk.co/lajefage/ehjgfjc/thruxton_classic_restoration.pdf
    • https://cdn-cms.f-static.net/uploads/4486535/normal_6061280a2de96.pdf
    • https://cdn.sqhk.co/vafegijateno/iOgd6XK/marketing_strategy_books_amazon.pdf
    • https://cdn.sqhk.co/rizinutix/MHTgfde/20602611808.pdf
    • https://cdn.sqhk.co/setuboluraje/Iji3gcQ/49353280497.pdf
    • https://cdn.sqhk.co/rosojolude/fgf9Gio/41609070450.pdf
    • http://homiak.fun/62532196900710bb.pdf
    • http://tvoeobrazovanie.fun/17201014921gqt5f.pdf
    • https://cdn.sqhk.co/suzeboxiwo/Gjhephh/dark_side_of_the_moon_meaning.pdf
    • https://static.s123-cdn-static.com/uploads/4469641/normal_6003426d7e754.pdf
    • https://cdn.sqhk.co/kijowevo/3djhAuZ/dodge_challenger_srt8_392_performance_parts.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zunaduxa/worksheet_3_literal_and_figurative_language.pdf
    • https://uploads.strikinglycdn.com/files/6710b644-7aa3-47b8-9d56-227577c23d2f/how_much_money_does_a_cfa_make.pdf
    • https://s3.amazonaws.com/guwutivupudutu/what_is_error_5_on_one_touch_ultra_mini.pdf
    • https://uploads.strikinglycdn.com/files/53618aa3-b262-434f-a632-f2bfe052480f/dr_brown_sterilizer_how_much_water.pdf
    • https://uploads.strikinglycdn.com/files/1e7bcdc2-2da4-490b-b34d-6bf5b4ca9073/96088855171.pdf
    • https://s3.amazonaws.com/xupimaral/gobun.pdf
    • https://uploads.strikinglycdn.com/files/81c997c3-0319-4d6a-b3a9-fee157af73cc/plc_programming_training_center_in_chennai.pdf
    • https://s3.amazonaws.com/rozebofukixus/82391681644.pdf
    • https://s3.amazonaws.com/wotodedaruzuk/dog_wolf_meme_template.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118bb.bin
76edee308a5741a7f5033b440b0ae6a0de6cffdfce50bf25ae446057cc6403af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 5252 bytes
font_01_sfnt_off00012a99.bin
bfab1acbf53d4b63e583c5a5cbfe0b196d35560a49805d22899432e912c91591		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A99 11480 bytes

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