Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbebfd2d854b8dd8…

MALICIOUS

PDF

80.8 KB Created: 2021-04-05 02:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b0eefc27eacf2abe30c8f73970df0aab SHA-1: 2e75cdef0ee1a52ad3c6370cf462f94059bc9653 SHA-256: cbebfd2d854b8dd8dcda7e37c4e1fdc299406be99ae7d35ea9bd4593bba561c2
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL that is likely part of the phishing lure, directing users to a page related to 'chapter 5 quiz 1 geometry answers'. The PDF structure and embedded content suggest an attempt to trick users into visiting this external resource.

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://leonvi.ru/aws?utm_term=chapter+5+quiz+1+geometry+answers+form+g PDF link annotation
    • http://matteset-spon.space/jezufooy23c.pdfIn PDF document text
    • http://gedawuxofawu.iblogger.org/65916569571.pdfIn PDF document text
    • http://gopadaxin.mywebcommunity.org/3043200015.pdfIn PDF document text
    • http://mxbur.fun/gufasapakalowapib51qib.pdfIn PDF document text
    • http://naturebiolog.space/rokejijolelojaropaxamuxuf0k1zn.pdfIn PDF document text
    • http://shoplus.info/35314657301u8ilg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fufapawaxuta.rf.gd/periodic_table_with_oxidation_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/mojakurij.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/asp.net_mvc_tutorial_visual_studio_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96e17f8c-3abb-4742-b023-ffe1fa5caa08/what_engine_does_a_2006_toyota_corolla_have.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/73057672713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c79e2f0b-d511-44e1-9332-16ba4591eca4/best_brand_of_ductless_heat_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e14a586-08ce-499b-b392-c53c544cdc45/79987721270.pdfIn PDF document text
    • http://jigisasamupor.onlinewebshop.net/respiratory_and_metabolic_acidosis_and_alkalosis.pdfIn PDF document text
    • http://bemuvubovewe.epizy.com/lerekiduvegadokazemasade.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/61235849842.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/android_9._1_version_mobile.pdfIn PDF document text
    • http://tixipisorovebog.epizy.com/velefalexefoxajutatifalag.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/a_monster_calls_script.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 5732 bytes
SHA-256: b7945a42bdc3fb7458462173bf9268b8584c9b2cc27638caf4c68fd0f290fd98
font_01_sfnt_off0000f7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AE 12136 bytes
SHA-256: ceed3c6d942a77abdb06a01d71e961604a43b8929a0baed0529c59cf6d94a690
font_02_sfnt_off0001209b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209B 16160 bytes
SHA-256: 91185b16eb2b8c7a3f2cefbca4bc5080ef3cb04272401404222370213c5c6f9f

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