Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3452e4c3ea3c70…

MALICIOUS

PDF

84.4 KB Created: 2021-02-22 14:17:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c0f28ec19ccdaed80acd7bca50d8d408 SHA-1: 8c1bbad9f895872b6d379f2d5df8e5e51f72fbf0 SHA-256: 9c3452e4c3ea3c709e5a41a4124b5ef215d142947c1bcda4308f9abed094fa30
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'https://baarspo.ru/strik?utm_term=multivariate+negative+binomial+regression+spss', which is likely a phishing lure. The document body, though heavily obfuscated, contains text related to the URL's UTM parameter, suggesting an attempt to disguise the malicious intent.

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://baarspo.ru/strik?utm_term=multivariate+negative+binomial+regression+spss PDF link annotation
    • https://cdn.sqhk.co/lilapanorup/ejdhi3b/gesinegilafejawifofusizo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499995/normal_5fc8344e55525.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/xNiblha/vunewavepitusigukis.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/iiiJgfs/sony_srs_xb12_sony_music_center.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/jb8Thi1/detimurusotuxukezobu.pdfIn PDF document text
    • https://cdn.sqhk.co/wanukawuwota/dhcgcif/85964481032.pdfIn PDF document text
    • http://sibuvre.com/xutulerewigojbtn3.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/lopadivupudexa/2015_chevy_traverse_ls_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/transformations_of_the_rational_parent_function_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/android_applications_programming_language.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/18307246036.pdfIn PDF document text
    • http://xedekig.rf.gd/rapimuzebul.pdfIn PDF document text
    • http://kotidaw.epizy.com/zepoju.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_off00010ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 5344 bytes
SHA-256: e64fef6a920ea0bebb087031c26d79fb2d48125677d7a7ec1acb7b6d0fcc21d2
font_01_sfnt_off00011dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 11560 bytes
SHA-256: 936edc44781f753bf425c0205df017007295d2174af7b0870dc133524e5899e5