Malicious PDF — malware analysis report

Static analysis result for SHA-256 98feaa19f55dc5c2…

MALICIOUS

PDF

83.5 KB Created: 2021-03-01 21:08:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4aa82c1665e2fe9654404a09926bfbdf SHA-1: 98d90b96078f417c59d2bca7a066ee16628dc0d6 SHA-256: 98feaa19f55dc5c2c4a7cbb32613ac70e6fa510b3f43025c4ab437d1972b41cd
96 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, contains text suggesting it's a worksheet answer key, likely a lure to direct the user to the embedded malicious URL. The presence of embedded URLs and the overall detection profile strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/wix?keyword=simple+machines+worksheet+answer+key+science+spot PDF link annotation
    • http://duzegipim.22web.org/bell_hooks_all_about_love.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/nixebiwajakag.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/what_is_the_default_password_for_night_owl.pdfIn PDF document text
    • http://momarivido.mypressonline.com/piriformis_syndrome_stretches_and_exercises.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/best_workout_books_bodybuilding.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/nigunupokuvekuxopumax.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/biahcig/what_happened_to_the_wolfpack_brothers_2020.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/94338933607.pdfIn PDF document text
    • http://medazuxa.mywebcommunity.org/garmin_920xt_manual_portugues.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/nopomewegobij/xenutejubuno.pdfIn PDF document text
    • http://musolag.rf.gd/professional_quotation_email_template.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/19984238986.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/49353307331.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/absolute_value_inequalities_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/97005732023.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/23277053548.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/88420125612.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/fegase.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/nujixagaleviw.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_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 5532 bytes
SHA-256: 4b59bf1d4532801ee9d4a805362383ac79f4d73f5a0cb29f72341bf146050d6b
font_01_sfnt_off000106b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 10360 bytes
SHA-256: 6bf3e53bfe667edc00f72283724889d57018fb1ccaccb655ec19012ab656d6be
font_02_sfnt_off00012a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A29 16448 bytes
SHA-256: d46a56b4c530a219a9eb2a873f84f8894c58e7bdfe0f2c067fff551c58eabffc

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