Malicious PDF — malware analysis report

Static analysis result for SHA-256 851d7b8dc1cfecd7…

MALICIOUS

PDF

86.8 KB Created: 2021-02-07 11:19:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ef950cb02498208642af87d6ee702762 SHA-1: 60b51103b787b2b2f652cd72983a12ab9a13e1aa SHA-256: 851d7b8dc1cfecd7c0426bdccb4e6114fcbd535bad0ad0b7ddbfa79ac089c43c
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 high risk score. It contains multiple embedded URLs, one of which is directly referenced in the heuristic findings, suggesting a phishing or credential harvesting attempt. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, likely intended to trick users into downloading further malicious content.

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://bologen.ru/wb?keyword=following%20directions%20worksheet%20for%20grade%203 PDF link annotation
    • http://masonufidowex.iblogger.org/email_writing_format_for_12th_class.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489969/normal_5ff26f5025de5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463825/normal_5ff593781f215.pdfIn PDF document text
    • http://makamar.xyz/59998507967a4btq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413361/normal_5fceb29c69e0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450415/normal_5fee407a19972.pdfIn PDF document text
    • http://fuwefepor.iblogger.org/adverbs_and_conjunctions_worksheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377414/normal_5ff67a4f3b47f.pdfIn PDF document text
    • http://wefabawatewe.22web.org/fast_leatherworking_leveling_guide_gw2.pdfIn PDF document text
    • http://sopizubivivelam.iblogger.org/revix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_5fdc4f4ecba8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_600d6c0c12bea.pdfIn PDF document text
    • http://azalea.store/how_to_learn_english_fluently_free_download4ovk7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407313/normal_5ff593ec25496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424009/normal_601f2b0f23ea6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diribiboturo.epizy.com/boy_scout_uniform_guide_sash.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 5560 bytes
SHA-256: 3d5a7cb96284d339080ceb7d99c3b6fb30ae4ca5ae6dd06ca4cdc4c5ec9448da
font_01_sfnt_off000128e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E7 10992 bytes
SHA-256: 6768ff88421d7307dc826814c6b3968045c6e130d54dc09a2e447928b7114c4d

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