Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc6663410e4b3b4…

MALICIOUS

PDF

74.4 KB Created: 2021-03-20 12:10:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b686d40a8de13c2107fbf5ff9375b6f0 SHA-1: e327afe1fed4cbfcc855e6d5381f96b3bcaee2c7 SHA-256: bbc6663410e4b3b48cfe52f9bfafbf3caf9df8991e3e20e0f65f35bd31037e2f
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL and the document body suggest a phishing lure, attempting to trick users into visiting a site related to 'math exercises'. The presence of PDF-specific heuristics further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/award?keyword=mathe+%25C3%25BCbungen+br%25C3%25BCche+pdf PDF link annotation
    • http://kopavavabigi.66ghz.com/xejuw.pdfIn PDF document text
    • http://trokot-shtorki.online/types_of_curriculum_design_in_k_to_12t98oz.pdfIn PDF document text
    • http://ukranews.icu/xawoxubezimerejopanoboboxodmhp.pdfIn PDF document text
    • http://cancandance.org/vector_autosar_training4hxbw.pdfIn PDF document text
    • http://wowezixuxaxu.22web.org/clat_2019_answer_key_consortium.pdfIn PDF document text
    • http://pubgucbayim.com/what_does_briefing_means_in_spanishyhxbg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gebogozomusedom.rf.gd/vayne_guide_9._20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b84a63d-423d-4d69-a0a3-932376d6d3aa/vijegixinugezojotok.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/zusoxonujovidamedoge.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/tunew.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/the_backyard_homestead.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/bengali_calendar_2017-_18.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b936ac0d-f1a2-4786-93ae-566175d3c869/39994418457.pdfIn PDF document text
    • http://kirezujanavibos.epizy.com/molawiwuveno.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/dungeon_siege_2_companion_guide.pdfIn PDF document text
    • http://viziboxovuw.rf.gd/simplehuman_soap_dispenser_wont_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/42867937795.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/53366730113.pdfIn PDF document text
    • http://dupetomumipur.rf.gd/history_staar_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae5bc7be-b79e-4967-b37e-7181b9baa0ab/dell_xps_8300_desktop_specs.pdfIn PDF document text
    • http://ruxuwidoke.epizy.com/american_tv_guide_new_york.pdfIn PDF document text
    • http://sogonuvusawi.epizy.com/various_forms_of_physical_exercise.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/what_is_projectile_motion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f385ce-da6c-46ee-9b92-0d4b5be20e0e/yellow_cozy_curry_seaside_or.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_off0000e2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A5 5472 bytes
SHA-256: 5d9f848ad199881f004fb4dbb992a2e3b93d5836d55513f352d51e323c3e6cbb
font_01_sfnt_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 11416 bytes
SHA-256: ab76b9d83c230de6b28f97aa57cfa1a9bb9946107281cbd8da3f00cce6280b96

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