Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89643da2e7bdbc2…

MALICIOUS

PDF

75.0 KB Created: 2021-03-09 11:08:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c87c26be09a728dafc8f8fba0f2f7120 SHA-1: 211db71daa2a5a4c960deb06833e2b8e54ea5815 SHA-256: c89643da2e7bdbc2be763bb14ca2d4d199ab7206d5db8a8cecaedcc570e17a9a
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a social engineering lure, presenting itself as a Google Chrome bug report to trick users into installing unwanted software or extensions. The embedded URL points to a suspicious domain, likely serving as a distribution point for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://zajinet.ru/123?utm_term=google+chrome+bug+report PDF link annotation
    • http://pazujiz.mygamesonline.org/trials_of_apollo_book_5_wiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484804/normal_5fdab858b07c5.pdfIn PDF document text
    • http://sisogelodaze.medianewsonline.com/fender_hot_rod_deluxetm_112_enclosure_lacquered_tweed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_600aacd08c3b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447270/normal_5fdda38fc9a02.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/julepuxotilesilodujokex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410431/normal_60272706d7895.pdfIn PDF document text
    • http://kixumitusomu.iblogger.org/how_to_heal_a_child_with_trauma.pdfIn PDF document text
    • http://vepekideku.iblogger.org/dalagunag.pdfIn PDF document text
    • http://neliwiveles.22web.org/transformare_din_cm_in_inch.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/pewibim/monster_hunter_world_switch_axe_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/react_native_android_assets_folder.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/23213263328.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_795991757cb34edd87bf384250b7d304.pdf?index=trueIn PDF document text
    • http://nogojituwizax.epizy.com/46850817629.pdfIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_2e1df0111fb5428c8eb5e432b1fd69c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/lord_of_the_flies_vocabulary_chapter_6-12.pdfIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_8e32907efbf445f58ebe0997dab8d162.pdf?index=trueIn 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_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 5132 bytes
SHA-256: 14ec68d7e5b1005eee4879e3d06435f68181653c031721963625bba939e3fc1b
font_01_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 10772 bytes
SHA-256: 2c0944f4d2f40ae74eb7621a49c3971a4489acda539084bd09d41e42c63db5d0

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