Malicious PDF — malware analysis report

Static analysis result for SHA-256 7900d4e1513c5b48…

MALICIOUS

PDF

86.5 KB Created: 2021-01-24 13:35:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fbe9f0119339c2857ea7f579bd83ccb0 SHA-1: 9dc8372f4486faca6a00b197132a65f50cf48348 SHA-256: 7900d4e1513c5b484230c41cd5393b094e135008eb8c03b274d09ce18d4b24ad
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a download button lure and an external URI pointing to a suspicious domain suggests the document is designed to trick users into downloading a secondary payload. No scripts were extracted, but the overall structure and detections point to a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/123?utm_term=spider+solitaire+unblocked+download PDF link annotation
    • https://cdn.sqhk.co/vimewiki/jiihjaD/86318890079.pdfIn PDF document text
    • http://eeeeeyyy.space/larotasuwedelifinidxp88c.pdfIn PDF document text
    • https://cdn.sqhk.co/pemiduwegam/sYjh9hg/bts_songs_offline.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367275/normal_5ff22e44eccf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475729/normal_5ff4b2b1002a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460241/normal_5fe99f7c1c703.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/YihjjgO/ninja_air_fryer_pressure_cooker_best_buy.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/8xhg2Qt/71157084474.pdfIn PDF document text
    • https://cdn.sqhk.co/gibuzini/1M7c4gc/3999111040.pdfIn PDF document text
    • http://kernig.online/50063570995ai390.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/royal_dutch_shell_annual_report_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/57038246200.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/53163067305.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/5049085334.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/pdf_file_sample_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/44134737101.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/xilede.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 5468 bytes
SHA-256: d8517a17d96b52c6ca6652cd3b68fa7c85bc91a984b09aa2e1c094ba2d23b972
font_01_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 15828 bytes
SHA-256: afdab7856a072ce24af4d1ea2fea6d705206785ebee4dcc21a3cfd1b83cd4c5b
font_02_sfnt_off00013641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13641 16532 bytes
SHA-256: 3c0f8acec51e0e0e243291ddb5f77aa084930f73b54e75b9e25b6d61952bec4d

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