Malicious PDF — malware analysis report

Static analysis result for SHA-256 812bd73673e004b4…

MALICIOUS

PDF

74.7 KB Created: 2021-04-06 22:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a2c39c298dff7c5cb0e037a58a560e2 SHA-1: 6b08364c71491bc251de847a45da983084fe8376 SHA-256: 812bd73673e004b45b7b80ddbbe35ee8ef170d7452dad7d4ba96e50426621115
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 heuristics indicating the presence of external URIs. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The numerous extracted URLs point to potential phishing or malware distribution sites, indicating the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crophysi.ru/award?keyword=anisometropia+y+aniseiconia+pdf
    • https://static.s123-cdn-static.com/uploads/4496360/normal_5ff54dd6c8d70.pdf
    • http://aycotoro7.xyz/playstation_store_gift_card_gamestopapnzd.pdf
    • https://gepadagonuvo.weebly.com/uploads/1/3/0/7/130775626/gonexipupatixaz-vewuxeru-ketosalano.pdf
    • http://italywow.info/tizapedojezajuwekibewake8mrqy.pdf
    • https://cdn-cms.f-static.net/uploads/4402724/normal_6012321b6a3de.pdf
    • http://xafopawiki.medianewsonline.com/how_to_adjust_stride_length_on_elliptical.pdf
    • https://cdn-cms.f-static.net/uploads/4446761/normal_606402c59beac.pdf
    • http://fragcups.com/7098041440uc14y.pdf
    • https://cdn.sqhk.co/mivuxakadu/ibhdOig/40139273513.pdf
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/gisewegebitu-suwun-witir-fofawujegilozo.pdf
    • https://sonefuvik.weebly.com/uploads/1/3/4/3/134325549/mipadade_taxari_rapemotafi.pdf
    • https://cdn-cms.f-static.net/uploads/4423772/normal_60246a6d369fa.pdf
    • http://vsedlyatebya.xyz/fighter_diet_cookbookcu8qg.pdf
    • https://static.s123-cdn-static.com/uploads/4460071/normal_6004c05fa00df.pdf
    • http://creamwalls.space/biwebojasunalewozuy4qh3.pdf
    • https://tafuposavibado.weebly.com/uploads/1/3/4/0/134017079/585663.pdf
    • https://static.s123-cdn-static.com/uploads/4375196/normal_5ff64d24346b0.pdf
    • https://cdn.sqhk.co/xubuzivo/gJ6jbgd/setetibi.pdf
    • https://cdn.sqhk.co/xasexuwosul/gMidgjY/google_maps_street_view_sri_lanka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dovunufesesiz.onlinewebshop.net/deep_learning.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f008.bin
764ff52c1845cc5d9ef6c441e8462dc867de04ce6ca7ed26c1608c294cee70cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 5360 bytes
font_01_sfnt_off00010238.bin
7425f283a1f9e7989069b954c7142612d87972d6036e24b1a2cf43b480ea58d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 11744 bytes

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