Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e1dd4276bd72b5…

MALICIOUS

PDF

67.6 KB Created: 2021-04-08 06:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4da270fabdc8fd1b8cac8a38dfd1cf54 SHA-1: 293232d42cd57397fe4e4108b970fe576bb7dfc9 SHA-256: b3e1dd4276bd72b5dee8bccd20b1c03404b38124a9b94d825477eddc7f781365
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URL pointing to 'resalured.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to an 'apostrophe worksheet', indicating a social engineering attempt to trick the user into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=possessive+apostrophe+worksheet
    • http://table-wait.com/which_omron_bp_monitor_is_bestxu4k4.pdf
    • http://vexetifiridik.mypressonline.com/87617090132.pdf
    • https://cdn.sqhk.co/vitimosugu/OAqOsig/27859916575.pdf
    • http://yewes.fun/hp_officejet_4500_drivers_downloadidvk7.pdf
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdf
    • http://ketaton.mywebcommunity.org/negafefituvax.pdf
    • http://itawegan.fun/dvam1.pdf
    • https://cdn.sqhk.co/gobenebovi/cigAJDO/33161378387.pdf
    • https://cdn.sqhk.co/kitujesijak/hfP7jeW/black_reaper_pepper_scoville_rating.pdf
    • http://marketeuro.pro/fanomajidotab3fkh.pdf
    • http://vir-tus.com/vasasipakexawosovapekpdelr.pdf
    • https://cdn.sqhk.co/xemugugafot/nEjhhcM/xukajujixilek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_0846f6265f894fa780d8e9063376eaa2.pdf?index=true
    • https://4c8cc264-4606-483b-a6fd-3ab48ba5c15a.filesusr.com/ugd/c626f4_ef7efe358b5545c6a92e52684c7d4868.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0dedbe64-5479-4ba7-89c5-c9325a8a8f19/pulgadas_a_milimetros.pdf
    • http://wutejaxevewef.myartsonline.com/damarobebitenawegimitale.pdf
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_a734fa2b8a2647049e8ddb73909449f2.pdf?index=true
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_49f6cadd36b641a79ee2b3d770a34240.pdf?index=true
    • https://uploads.strikinglycdn.com/files/828bddad-8612-47a4-827b-e1aabaf48281/king_kutter_rotary_tiller_reviews.pdf
    • https://3d1db4d0-c196-4dd3-8d5c-bb108cafbd43.filesusr.com/ugd/479e38_824ac1119b0648ec961e8fc5140f8616.pdf?index=true
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_f52ddafafbef4822b1bff450b2f037cd.pdf?index=true
    • 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_off0000ca9a.bin
42676abbae0c3044ca6417e1a066af9508bf1d930570899325b8cac753f4eb4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9A 5092 bytes
font_01_sfnt_off0000dc02.bin
8a7ac19aea09f3fcf8d000027ea7e2a8f020048d31d6cc620f192a733896da2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 10884 bytes

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