Malicious PDF — malware analysis report

Static analysis result for SHA-256 b570364cdfa9f884…

MALICIOUS

PDF

73.2 KB Created: 2021-02-17 03:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fc635a978cac088614f4fc34e721de45 SHA-1: 238d95c26ff49e595793a97ac53921426c76bf02 SHA-256: b570364cdfa9f884f690afc9a16ad0a04c6ba54edc90b78a76e893863e7fbbe4
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. The document body, though heavily obfuscated, contains text related to 'Christian calendar 2020 pdf' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure for users searching for such content. The embedded URL points to a domain that is likely part of the attack infrastructure, intended to serve the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=christian+calendar+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/vunebegawiwa/hiMJ3hb/lyrics_fallin._lrc_why_don_t_we.pdfIn PDF document text
    • https://cdn.sqhk.co/wotirixa/e2jwm8N/veposejisufowifigovazobos.pdfIn PDF document text
    • https://cdn.sqhk.co/rawegili/0gcgfgg/alien_swarm_like_games.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/bhhbLgs/jigonuvajaj.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/jb27jdm/xepokimidugab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460725/normal_5fd7f4b9e9c81.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/IjaAuJ9/download_piano_tiles_3_mod_apk_despacito.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/YU4hjjj/80s_and_90s_rock_music_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/hiehajb/verizon_my_fios_app_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/f2sjbAc/82437316427.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/suzujewa/access_control_policy_iso_27001_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/76886671180.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/29284212488.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/69378518791.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/89768484640.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/gomovurujitu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 5220 bytes
SHA-256: b7bc155aa6cf899b7ae6260d6f46376a75f09a77d6f3faf9995ddae2caec7012
font_01_sfnt_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 10428 bytes
SHA-256: 0195a3c52e06dbba6102e582eb5bf16bf8e0f1ef37fb3748e6cd1e8cb4b52169
font_02_sfnt_off000109d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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