Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab14ea2df4d67ce…

MALICIOUS

PDF

72.7 KB Created: 2021-03-05 12:25:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 687518373f7510cf457abfd0c9fc785d SHA-1: 856f3620cd4486e3e35a547d55f8991522bb5b6e SHA-256: 8ab14ea2df4d67ce396d100571c49d61972a5de258faededb1a569b4e339c361
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the document with high confidence. The document body, though heavily obfuscated, suggests a lure related to educational materials, aligning with phishing tactics. No scripts were extracted, but the presence of malicious URLs points to a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=smart-kids+english+grade+1+workbook+pdf In PDF document text
    • http://rinusiwujegabu.medianewsonline.com/vuluzeloforo.pdfIn PDF document text
    • https://cdn.sqhk.co/wemukubiv/kXwjaie/16352248359.pdfIn PDF document text
    • http://nozafonavuf.iblogger.org/loxolamuriwowasupulidaj.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/longman_dictionary_download_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunagakiz/fjf4Ijg/youtube_funny_videos_2020_clean.pdfIn PDF document text
    • http://eglo.club/kejumomipatodosinomebecg5l2.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/SSkhjK2/41538330630.pdfIn PDF document text
    • http://bestsaleshopin.xyz/5611111495jthw7.pdfIn PDF document text
    • http://kugewezebuvigiw.mygamesonline.org/77541344530.pdfIn PDF document text
    • https://cdn.sqhk.co/wozobifanu/5LdNWjb/90553170252.pdfIn PDF document text
    • http://blog-millionaire.buzz/31518879218xdynv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/dejakumijozivegemetegevel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/103fe922-3968-485d-8fa0-176931bb2702/risukof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65094f72-79e4-4f07-b3ee-7bf6e5d92e87/xolozuremerabanolaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c876cb2-9df2-4954-9207-ca7429e5b527/lozezujosidesepupavetivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1821302-feb9-4b84-aac2-08804e4516fd/22175673071.pdfIn PDF document text
    • http://resipivoxopir.rf.gd/answer_of_how_have_you_been.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/vokutulikazupax.pdfIn PDF document text
    • http://tisumejokilufon.rf.gd/bunukunisapedebaxazuza.pdfIn PDF document text
    • http://kojajopi.epizy.com/dijokapagisadezunid.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD162 5724 bytes
SHA-256: 5d4764f7fc485d136a546cb804b44c5dd92f83048b6d8b6ee1503fa95bf74f8f
font_01_sfnt_off0000e4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B6 10076 bytes
SHA-256: b6775f5e9244a6f276b3b439c2b03ab976c78f0b2da1bcbf85545e6d8200ae69
font_02_sfnt_off00010749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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