Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e933a57c523aa18…

MALICIOUS

PDF

69.3 KB Created: 2021-01-06 08:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 805dd85727074b3b0e3b309b240037ee SHA-1: 79efdca4b914bcaeb03e60847ea9c635ea355c56 SHA-256: 0e933a57c523aa1825539f560c011335ef6e23cbadbe6b634ded97e7a71269c7
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by heuristics as an external URI and flagged by ClamAV as malicious. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be related to a 'size guide', suggesting a social engineering pretext to entice users to click the malicious link.

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://trafffi.ru/aws?utm_term=mercer+amsterdam+size+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448558/normal_5fd64ec9dc931.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/laradusa/mazda_cx_3_owners_manual_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/attendance_management_zk_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/kakuma.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/cat_song_video_punjabi.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/free_cv_template_in_nigeria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3abb1b1-8070-4446-8d5c-246ccbeb6223/xorabuvazaxot.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/dosububosiwukupafavomolu.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/analytical_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/tagonig.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/appreciate_employee_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/california_time_to_answer_after_demurrer_overruled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b29f4d97-bd7b-4bba-8e1d-85d44c8af3bd/14904447052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9c43c9-babd-4571-a3ee-a294f0691cd9/smartphone_buying_guide_2019.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_off0000ced4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED4 5284 bytes
SHA-256: 5ead89ed7d3b0f93109f8e4bbb8132e08f797450738fb5d8486ca9bf31ce9c23
font_01_sfnt_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 13308 bytes
SHA-256: ecdaebb3677075197407d6477c64c98cc640a53e079af713778dd545e1380452

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