Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbc3f158edadd89…

MALICIOUS

PDF

74.0 KB Created: 2021-03-15 13:59:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: eae8c42598203911bd83932901886f3f SHA-1: 2a7c2e78e5745608c70816e5f537f2b7fbe159d4 SHA-256: 1bbc3f158edadd89dc1616520717812436110d4c92e1e25efc8c7a3775781df6
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating the presence of external URIs and is flagged by a machine learning classifier and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Trig identities practice problems pdf'. The primary malicious URL identified is 'https://seumenha.ru/strik?utm_term=trig+identities+practice+problems+pdf', which is likely used to deliver a secondary payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=trig+identities+practice+problems+pdf PDF link annotation
    • http://options.expert/57370940584pg03w.pdfIn PDF document text
    • http://iceteas.space/puxuzimo7t4j1.pdfIn PDF document text
    • http://dietnatur.fun/sudumos0xsh.pdfIn PDF document text
    • http://dragonflysagewellness.com/gadudodiwx1ax1.pdfIn PDF document text
    • http://1xbet-football.fun/7881985179simid.pdfIn PDF document text
    • http://biomanix.best/libuxosefukomiy8e5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408336/normal_600aa135d604a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495244/normal_604a8e32261ac.pdfIn PDF document text
    • http://firstreadersclub.com/ac-_300_calibrator_manualt5u01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5fd9b0ec74466.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/zesixefe/cestina_express_1_chomikuj.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/interest_rate_swap_contract_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/how_to_deal_with_conflict_in_leadership.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/richard_clayderman_piano_sheet_ballade_pour_adeline.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/wordly_wise_book_6_lesson_5.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/xetefososifogij.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/mixubivimalapezotebagi.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/bharat_songs_on_ming.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/soccer_goalkeeper_training_the_comprehensive_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/pewemuwere.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/nujoseridetunerili.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_off0000e1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EE 5564 bytes
SHA-256: ef2008f19f21c483e60051eb14c17527511a529dce7ee890f5f16c4dae2a2d27
font_01_sfnt_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 11600 bytes
SHA-256: 00131b0768af9831bd2089e4fe2718e66ead42410cf67bb592626513f8a8aace

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