Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76ce8ac2b1566c3…

MALICIOUS

PDF

75.8 KB Created: 2021-05-03 14:40:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6f53077db4bb1ffe2c7eeb4328081571 SHA-1: fc18bf91abcc3f36cf3672919f391a3f26360bec SHA-256: d76ce8ac2b1566c3a3b1dd87b75258fd894d0234c8c54968f900e21288432ae4
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to English exercises, likely to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=comparatif+superlatif+exercices+anglais+pdf PDF link annotation
    • http://xisofujevom.22web.org/why_are_my_wireless_earbuds_not_charging.pdfIn PDF document text
    • http://tegikelekosux.22web.org/maple_leaf_rag_piano_sheet_music_original.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c71e99e6-6bca-4fba-91bd-e1bdff85c8cb/73477485214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93034171-27e7-46cd-8e0f-f479f969e5ab/32141135517.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/bumojuxoxaf.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/any_video_by_link.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/what_documents_are_needed_to_get_cdl_permit.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/cbre_group_inc_annual_report_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/99925066045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a5f64f-18ea-45b6-a32e-4501b0b82821/86178460047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9f056c0-40b9-4d48-9ded-2c54271db3d5/87579093845.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/rutokagil.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/bobcat_requirements_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/how_does_a_singer_walking_foot_work.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/android_okhttp_post_example.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/dazemasitudidiw.pdfIn PDF document text
    • http://sifirajudexotiz.epizy.com/ice_bin_sachivalay_model_paper_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/go_tell_it_on_the_mountain_novel_by_james_baldwin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1427c3ca-d1af-4aab-8771-e1599fb27fc5/bell_schedule_paloma_valley_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/29263929408.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/74902271735.pdfIn PDF document text
    • http://vixuzuvubus.rf.gd/brilliant_young_mind_full_movie.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_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 5448 bytes
SHA-256: 38efc7f1572770b1ec136ce311edc9fcf4561b22dc6f02f29fd43b61259b2ab8
font_01_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 11716 bytes
SHA-256: 8e7c3260c75ba1286fa66321bd93084f8fe20301a941264b427bf34b0ef9eea5

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