Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8cb2137775e2d1…

MALICIOUS

PDF

60.4 KB Created: 2020-11-22 13:32:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8547400cbabb204f7577ca11c94fd82e SHA-1: 9f2ea7050e10c7e112d533c8b711e03780df832d SHA-256: bc8cb2137775e2d100504492397edb6fd50a9a629f90eb42d4a10e505873ea1a
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 ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely intended to trick users into visiting the malicious URL. No scripts were extracted, but the presence of an external URI and high ML confidence indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffi.ru/123?utm_term=chapter+6+review+chemical+bonding+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372376/normal_5f8b31aab513a.pdfIn PDF document text
    • https://baxinumep.weebly.com/uploads/1/3/4/3/134366260/009c63e870a8e4c.pdfIn PDF document text
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/makizupakina-mosoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383678/normal_5f9700bf3a936.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/4b5279be-f346-4532-81ca-de77ae43f85b/22371480743.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/21st_anniversary_gifts_traditional_for_men.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/man_on_the_street_interviews_microphone.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/dibujo_arquitectonico.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/durojugedibubu.pdfIn PDF document text
    • https://s3.amazonaws.com/lopazura/free_harley_service_manual_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xebareto/english_childrens_stories.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/jopofimubuxuxeli.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_off0000b08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08E 5904 bytes
SHA-256: 32997d6de7847b8e9e3c325c37d6e4bf9787bd262cf2885fea7260f2f7f8245b
font_01_sfnt_off0000c47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47E 9476 bytes
SHA-256: 1b5802b32fef0012b4571e5d9b2b1d1132f4eae5dff33fcee57d0cf91e1bccc3