Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c87de0206e6ad5c…

MALICIOUS

PDF

63.6 KB Created: 2021-02-20 14:49:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5a4a6ddc1b6b861efd6e232d5f5eecd2 SHA-1: 6a5713cd444578214ee26ff77ddb70836f93b860 SHA-256: 9c87de0206e6ad5cecfda9951e98ee21dc5960ad6462fde2e0f7a8bf99c92c1a
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to 'gas stoichiometry gizmo answer key', directing users to external URLs for further content. No scripts were extracted, but the presence of numerous external links indicates a likely attempt to redirect users to malicious websites.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/wix?keyword=gas+stoichiometry+gizmo+answer+key PDF link annotation
    • https://ruvedusipokowu.weebly.com/uploads/1/3/0/8/130813644/vodanedagurajepodik.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/fCjjfJS/playmobil_ghostbusters_2.pdfIn PDF document text
    • https://cdn.sqhk.co/mudaxomemut/a72iaiO/swing_go_launcher_themes_free_download_mobile9.pdfIn PDF document text
    • https://cdn.sqhk.co/dusujukakal/ghigjjf/disney_princess_dress_up_trunk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445534/normal_60302a051da81.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/Sjahigj/destiny_s_child_survivor_album_cover.pdfIn PDF document text
    • http://jofarofuwudeveb.66ghz.com/expressions_and_equations_worksheets_5th_grade.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/sajatofubote/16684592588.pdfIn PDF document text
    • http://vuzudaru.epizy.com/biology_form_4_practical_book_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/61380686680.pdfIn PDF document text
    • http://munakazoxan.epizy.com/book_review_the_little_prince_by_antoine_de_saint-exupery.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/gukab.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_off0000bcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCE 5520 bytes
SHA-256: 9a8904b572fe1999f1527f464e3637f1a1b1fda11d3e69d9350abac4a3fe4c2d
font_01_sfnt_off0000cf90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF90 9992 bytes
SHA-256: be1c96360077b91e23628669b33834e15cebd0f3365d83a0c0ef6d6810c9f251

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