Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c486cfeb368b16…

MALICIOUS

PDF

83.0 KB Created: 2021-03-27 10:38:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7ae95063561ccd622bf0576899aad6e7 SHA-1: 15583f1f1f624b40e77406ac5687261d9d482f16 SHA-256: 91c486cfeb368b1665b3fb18453d0c0374eb929831988458e1faa736652f41c6
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of an external URI. The embedded content, though heavily obfuscated, suggests an attempt to disguise the file as a 'Population genetics problems worksheet'. The primary IOC is the external URL, which likely serves as a lure or a distribution point for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=population+genetics+problems+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409627/normal_5fe29c356c6fc.pdfIn PDF document text
    • http://wurigebajufopo.22web.org/politique_budgtaire_dfinition.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/7911455753.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388163/normal_6002375e1c8be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422912/normal_6054b66e96883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422906/normal_5fdad220601da.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/tikoweravisixu/96657721647.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/96211850393.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/45476892768.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83613655-af37-43e9-b8ed-fb836dc9079f/how_to_clean_carburetor_on_husqvarna_tiller.pdfIn PDF document text
    • http://wexejof.epizy.com/powerpoint_award_certificate_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/genejavomu.pdfIn PDF document text
    • http://viminug.epizy.com/phoneme_worksheets_for_kindergarten.pdfIn PDF document text
    • http://vedixemalirugi.atwebpages.com/vazopuwunobu.pdfIn PDF document text
    • http://momerizimapunu.epizy.com/6847123030.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/71542158560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e336342-d3c8-4768-93c1-34751fadd6bd/what_does_it_mean_to_be_peace_sign.pdfIn PDF document text
    • http://zijubeda.rf.gd/the_beginning_of_the_end_book.pdfIn PDF document text
    • http://vufobaratoja.epizy.com/19020661600.pdfIn PDF document text
    • http://xutagefev.epizy.com/wozukowujazugisiwufubuvo.pdfIn PDF document text
    • http://patabajisof.epizy.com/administracion_publica_federal_centralizada.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_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 5644 bytes
SHA-256: d525552b8fa7f24d991b7c855cd4bc35a00cc9c2864457289b5e5565b138a70f
font_01_sfnt_off00011859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11859 11268 bytes
SHA-256: 1407ce3d86e449648b79c6c3bdba21337df669b7d41ec282da3063838dddd808

Open this report in the interactive analyzer, or submit your own file for analysis.