Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e7b8a40a60713e2…

MALICIOUS

PDF

77.6 KB Created: 2021-03-26 07:48:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e4c542fbb7a009bfba46dcbe8195372d SHA-1: 24b45fd722bfb8ec10169647da953cc08a151d87 SHA-256: 0e7b8a40a60713e2f06eb29a499cc7e073dc3cbbc7183b75ad993c37e0f9473c
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to an essay template, likely to trick users into visiting the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/123?utm_term=cuegis+essay+template In PDF document text
    • https://static.s123-cdn-static.com/uploads/4385848/normal_5ff43101f1ddd.pdfIn PDF document text
    • http://dowosateti.iblogger.org/is_harry_potter_on_prime_video_canada.pdfIn PDF document text
    • http://dutebolidetol.iblogger.org/calorie_count_of_fruits_and_vegetables.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481839/normal_602ece021448d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zasagugidi.epizy.com/kakerafemixewutigamadetiw.pdfIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_e2b86f726b6a4e37bf6d7ee8694086a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/badodemebo/wopebivajikiru.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/87281632840.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/nifaxekosef.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/situational_judgement_test_right_answers.pdfIn PDF document text
    • http://mubidixosi.epizy.com/hailsham_community_college_sixth_form.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/battlestar_mod_vape_manual.pdfIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_d7bc011eca1042db9b68b9207db8aded.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/julaxel/fagezuvikepujog.pdfIn PDF document text
    • http://luzuzapubovug.rf.gd/switching_anticoagulants.pdfIn PDF document text
    • https://8b62b971-d575-4461-ae89-9de7a2afac08.filesusr.com/ugd/c5a911_5c6c0ec75384427ab2a65e9bc23d0705.pdf?index=trueIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_085bb2d6d9b242db97984ceaa0991a6a.pdf?index=trueIn PDF document text
    • http://kikivalisexe.epizy.com/android_app_bar_background_color.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_fe4ce4fdecf7418a96d367bb41d07b76.pdf?index=trueIn PDF document text
    • http://tanegonezato.epizy.com/comment_fusionner_2_foxit_reader.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_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 5052 bytes
SHA-256: 14b503b0500f4661360b845a6116c1709344a802b2ff10269a86e10f38a8c779
font_01_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 10588 bytes
SHA-256: 41caa8a1c26e895997fbab2288798bc1456a5070c4bacc8d58e663939fc66ac2

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