Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cee8d1077433e1…

MALICIOUS

PDF

73.2 KB Created: 2021-02-26 08:43:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a42d5ebdccd3de0b2373b2920645dfb6 SHA-1: 166e253a8d4fb579311f21c349e87fbda5469ffb SHA-256: a9cee8d1077433e11b582fb3bfe41137d0dd07b48d13e657e45e759b38ea24c7
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified by both heuristics and a machine learning classifier as malicious. ClamAV also detected it as a phishing trojan. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

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/wb?keyword=learn%20c#%20in%20one%20day%20and%20learn%20it%20well%20c#%20for%20beginners%20with%20hands-on%20project%20jamie%20chan%20pdf PDF link annotation
    • http://inter-kalinka.ru/nolixuzoxumipagoteladuwy4o6j.pdfIn PDF document text
    • http://topvideo.design/army_pt_formation4zk13.pdfIn PDF document text
    • http://cybety.xyz/indiapost_international_mail_trackingzd2qg.pdfIn PDF document text
    • http://wuteziben.iblogger.org/lolaketotidedomefuveni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403276/normal_602e1079108ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491671/normal_601261d98431a.pdfIn PDF document text
    • http://tryici.xyz/listening_pre_intermediate_worksheetsxsyef.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/xidazeze/13345254555.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/wasoka.pdfIn PDF document text
    • http://luzusimunire.rf.gd/how_much_does_a_special_education_director_make.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/ccna_voice_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/esc_dilated_cardiomyopathy_guidelines.pdfIn PDF document text
    • http://wotonopeg.epizy.com/bejawofedivaxiritilofa.pdfIn PDF document text
    • http://novotufimaxanu.epizy.com/nothing_a_chorus_line_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/likuxutezugafutusefodas.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_off0000e3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 4524 bytes
SHA-256: ffccad48fb80efd5f61ee91fe8e77f67a5c7ed0ceab4d7f1d1166042f37b401e
font_01_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 11020 bytes
SHA-256: 2589f538bf9b40ed034f615caa781ebdd393a668182a77812d8e0a8eaba59785

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