Malicious PDF — malware analysis report

Static analysis result for SHA-256 723046f9bbfe646b…

MALICIOUS

PDF

111.3 KB Created: 2021-02-10 15:13:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 40041e7790a0112bf919699bbcb76f50 SHA-1: 058c4ed9ab24f313762e33d6ab3d3e9c5e2cfa48 SHA-256: 723046f9bbfe646b6a5df4512c65ac98f4d25496c4c9ac85da83862111c0e406
154 Risk Score

Malware Insights

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

The sample was flagged by ClamAV and an ML classifier as malicious, with critical heuristics indicating it contains a malicious redirector link. The embedded URL points to `https://yafferge.ru/aws?utm_term=and%252F+or+form+definition`, which is a known malicious redirector. The document body is heavily obfuscated, but the presence of malicious links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/aws?utm_term=and%252F+or+form+definition In PDF document text
    • https://cdn-cms.f-static.net/uploads/4494160/normal_600c011f5b625.pdfIn PDF document text
    • http://belplitka.ru/essential_hematology_book_free_download6en7d.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/Vjfihja/47175163135.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/aluminized_plastic_sheet7v31p.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/WfhiYiL/top_music_player_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/novupezezis/egcjduZ/72344136006.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/eu8hfig/jukabasat.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/sieGiig/earthquake_survival_tool.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/xufujofaleki/wabinajuzupat.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/xalidosotilabejabef.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/89754973401.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/aqa_gcse_physics_revision_guide_oxford.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_off000176dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176DD 4656 bytes
SHA-256: 4fe3b1dc0f94ba20d81814ddeb3f86b17e85e0907d4487e8efc3f5230127ae5a
font_01_sfnt_off000186a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186A7 12772 bytes
SHA-256: d48e3479abb7fc919d4fa470d71ae909daee10f2e6244a8f5383ba2d07e5e1f4

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