Malicious PDF — malware analysis report

Static analysis result for SHA-256 60efcf132b1230de…

MALICIOUS

PDF

79.5 KB Created: 2021-05-20 18:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0710e5b701a242983517015e009a2962 SHA-1: 46711ab598f445de8d21ac431f8d94b9e53bc39c SHA-256: 60efcf132b1230de4cfbb62d0d4b6f9591c7c1cce5836fa04a45e8e98c5d9ac3
96 Risk Score

Malware Insights

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

The file was detected as malicious by a ClamAV signature and an ML classifier. It contains embedded URLs, one of which is presented as a review for an HP monitor, likely a lure to encourage clicks. The PDF structure also shows duplicate object bodies, a common obfuscation technique. No scripts were extracted, but the presence of embedded URLs suggests an attempt to redirect the user to a malicious site for further payload delivery.

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://cdn-cms.f-static.net/uploads/4388177/normal_60218613336da.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4383446/normal_5feb9469ee217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_5fe9b5d5e634a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_6065d04e44d86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_606eab3eaa96d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_6065f6284a0ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/3IgsHNHpEfs/wb?keyword=hp%20pavilion%2027%20inch%20monitor%20reviewPDF link annotation
    • https://s3.amazonaws.com/tapelu/gatufunototejuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07aec3fc-e057-438e-9d66-eadbcf7c52ed/magobinusonatojupeped.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/tejetixijeletariw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ac32cca-cd8f-497a-8558-a1c156767065/43602787872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8268f4d6-9d28-44ea-b41d-0b1d2c480b69/ikea_malm_bed_frame_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/43946066352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82e675e3-253d-4949-a424-a237a44e1f19/the_vampire_diaries_season_1_episode_22.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/que_datos_debe_llevar_una_ficha_bibliografica_de_un_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/n64_emulator_android_games.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/absceso_apical_agudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b124fb-f553-4913-bec9-7722a54948e1/46012871698.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/multivariate_analysis_vs_multiple_variable_regression.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/edexcel_a_level_biology_book_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/11583248385.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_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 5320 bytes
SHA-256: d335cbfcbde540e34494fe56327be63dad7291369dab12a066cc1b292c7ff691
font_01_sfnt_off00010afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 11172 bytes
SHA-256: df51a1af2641c0ade25e5b0a67a016084ed3aeda8d53b32429fa7411af57933a

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