Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66cdcd5e42aa7d9…

MALICIOUS

PDF

69.4 KB Created: 2021-05-22 02:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6a7f6ea9cd8e789812cc432e7ddba7f0 SHA-1: df103c369e98202ddc824a798d71979622fbdf55 SHA-256: f66cdcd5e42aa7d94fffb5b0d6a7e1d033e57f6da153e77d242948be7142ff1e
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. It contains an embedded URL pointing to 'resalured.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to educational materials, specifically 'endosymbiosis worksheet answers'. No scripts were extracted, but the presence of external URIs and the overall malicious verdict strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=endosymbiosis+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393346/normal_600bf2f025936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_604197f460515.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386613/normal_5fcd84569cad2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495055/normal_5ffdb50b42414.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454990/normal_5ff0702c5629d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449000/normal_6068a1a4124d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470553/normal_600dce779a1d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445119/normal_5ff121c843586.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/952eeb44-5149-488d-9b59-c52a1967d083/runotuwiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9cfd379-58f9-4cb9-b7fe-1c8f66ed693a/volume_and_surface_area_gcse_exam_questions_tes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f73519e-bbde-4498-81e1-784fe3d69175/71884938266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbed4e02-8a1c-4e7b-bcc7-861a1c486e4c/night_owl_recover_dvr_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49fdd6ae-7d89-4200-a4c2-b3e6a19c4433/twilight_2008_full_movie_in_hindi_hd_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/36619850365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aabc9eb8-9475-4599-b663-a3921764bc0f/1402211356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14083d91-5fef-4199-baeb-23037b54002d/what_is_the_ideal_healthy_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44f20299-46e6-4623-8cf0-363ce611a325/dell_optiplex_gx620_sound_driver_download_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/25077879244.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/81715703056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc3e450-d9ce-4b7a-8638-ca7a79ae6194/best_diaper_genie_for_dogs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e3db3f5-7421-486b-bcd3-903a2fe42ff8/fefixololikevizij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f0d38eb-233d-4633-a7aa-12ffd894b006/22341782161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25444f6a-d773-4d60-a2d7-5360756f139a/what_is_the_appraisal_process.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_off0000d01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01D 5388 bytes
SHA-256: abbfbc466e331ea4b8fd88ce68f475f0d4811ff1054f8577aa0fe7b0d271a934
font_01_sfnt_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 10516 bytes
SHA-256: 5498be5f4486264e2072548ee5b30b5820cb611597993ff15467a98a90131971

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