Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8d6d8e464423e6…

MALICIOUS

PDF

82.9 KB Created: 2021-03-14 12:14:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67911a0619929349f6fecaedbced41e9 SHA-1: 7315c81c3c5d8bc83ed8a3f5e4866e823a5ee184 SHA-256: 6d8d6d8e464423e64ef26887eba8da09b2e325ccd9173cfba42567e2d8b4b19f
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for ClamAV detection. It contains an embedded URL pointing to 'jacksth.ru', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick the user into navigating to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=cours+amplificateur+op%25C3%25A9rationnel+pdf+mpsi
    • http://zalavsky.ru/lefavi7medj.pdf
    • https://cdn.sqhk.co/risenulowo/gdhbf6N/21651172905.pdf
    • http://gojoxoxuda.22web.org/runequest_glorantha_bestiary_download.pdf
    • http://naturwow.space/hashar_movie_full_hdyy894.pdf
    • https://static.s123-cdn-static.com/uploads/4387698/normal_5fc917b51f355.pdf
    • https://cdn-cms.f-static.net/uploads/4496014/normal_6032f85b00830.pdf
    • http://mixed-rootwork.com/wowapq1nkm.pdf
    • http://salet.store/46631339749jly44.pdf
    • https://cdn-cms.f-static.net/uploads/4446761/normal_6019a9b4ecb54.pdf
    • http://axecheat7.xyz/limoxomenovotokatuzupm622.pdf
    • http://reestr.site/javascript_concatenate_strings_templatey45qx.pdf
    • https://static.s123-cdn-static.com/uploads/4412889/normal_5fcb436545ea3.pdf
    • https://cdn.sqhk.co/lasesekov/fge2QMS/what_does_apple_spend_money_on_uk.pdf
    • http://savadaqwe.space/arachnid_movie_in_tamil_free5mm63.pdf
    • http://optarfes.com/spice_and_wolf_manga_seriesqvkfe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1ecc16e1-6db2-489a-a1d6-895cd5c83f57/how_to_install_side_mount_dishwasher_brackets_bosch.pdf
    • https://uploads.strikinglycdn.com/files/ebc58c2f-342c-4312-9993-aa825281e872/wefakepoto.pdf
    • https://uploads.strikinglycdn.com/files/a1a45822-afa7-4afc-b5ae-3830dbb306a8/kiwuloziwudazanegep.pdf
    • https://uploads.strikinglycdn.com/files/a815395f-c208-47e0-acad-f0f4e37519b5/10890192191.pdf
    • http://rawatakutuju.rf.gd/garmin_945_user_guide.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb30.bin
6831657988f77b8c7f9692c9550ecb8122362a5d65ded29ebd947608c5bf441b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 5348 bytes
font_01_sfnt_off0000fcff.bin
d579558415aa9dc45b7687da6184af047df03a279f165e25e16490e2e50d92cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 12720 bytes
font_02_sfnt_off00012672.bin
4097a5bbc0198c4893d11163f7186b0c17f2aeede4bf1fb5cc2eb72a09526310		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12672 16232 bytes

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