Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c7d47288a5ca5e…

MALICIOUS

PDF

70.6 KB Created: 2021-03-24 10:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa2f24ae27e61944913b3f0fe61beee4 SHA-1: ea2f7a131c62534710f7ecd21b56e414ebd078d5 SHA-256: c6c7d47288a5ca5e26308687949ff1cbe5a2de4a400eeb03a5dea58556c70abe
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URL, https://midufefew.ru/wix?keyword=conflict+in+the+most+dangerous+game+worksheet, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a worksheet, aligning with phishing or social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=conflict+in+the+most+dangerous+game+worksheet
    • https://cdn-cms.f-static.net/uploads/4497369/normal_60419d6fea4ee.pdf
    • https://cdn-cms.f-static.net/uploads/4371025/normal_602a10e05087a.pdf
    • https://static.s123-cdn-static.com/uploads/4415322/normal_5fc9a86d9eab5.pdf
    • https://cdn-cms.f-static.net/uploads/4475559/normal_602753b40ecb7.pdf
    • https://cdn-cms.f-static.net/uploads/4490128/normal_604159040367a.pdf
    • https://static.s123-cdn-static.com/uploads/4369768/normal_60085cf4528ea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/521f5b61-fa7d-4a72-8c6d-0dfbff64b6a9/taco_bell_chicken_power_bowl_nutrition_info.pdf
    • https://uploads.strikinglycdn.com/files/ffae3bb2-c5a3-4777-af18-9cb9cb546142/95855931608.pdf
    • https://uploads.strikinglycdn.com/files/58510dcd-a50d-4c56-af05-39652b227268/personality_plus_book_in_hindi_free_download.pdf
    • https://uploads.strikinglycdn.com/files/b7550e48-7d28-4224-ac3d-3bc50904b80c/gopasafelop.pdf
    • https://s3.amazonaws.com/xamapebonijos/37199623113.pdf
    • https://uploads.strikinglycdn.com/files/a7b60abc-c8fa-49c6-b9bb-2c7688cf63ac/how_do_i_reset_my_epson_waste_ink_pad.pdf
    • https://uploads.strikinglycdn.com/files/50320f7b-a9e4-45c0-bca4-cce70b349808/numapejaziguvuvup.pdf
    • https://s3.amazonaws.com/xukonakefules/affinity_designer_size.pdf
    • https://s3.amazonaws.com/betefowubevat/lying_and_stealing_parents_guide.pdf
    • https://uploads.strikinglycdn.com/files/565f49b0-47d2-4a66-b3ff-10689adf1385/fx_a_christmas_carol_cast_imdb.pdf
    • https://s3.amazonaws.com/dowesitobuga/51114539083.pdf
    • https://uploads.strikinglycdn.com/files/51629fa2-0f1f-4d11-9bc5-4592e1aeb8fe/sunuzutoji.pdf
    • https://s3.amazonaws.com/nodetuxapabara/amway_atmosphere_drive.pdf
    • https://s3.amazonaws.com/bajapovogam/kindergarten_worksheets_letter_l.pdf
    • https://s3.amazonaws.com/bipepezuwed/81681971147.pdf
    • https://s3.amazonaws.com/fibesezati/news_report_today_video.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d617.bin
a9203e2c4e8e6a2fc0fb9e65502da3589722795b04e8b530d3a51cbb798dbc3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 5496 bytes
font_01_sfnt_off0000e8b1.bin
03499f377788736055203594c3c99a0165053f122efa2a420a5e3c8d06127f92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 10580 bytes

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