Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e0f8e74d079aee…

MALICIOUS

PDF

73.9 KB Created: 2021-04-04 01:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1992a145e7508a64da08e8b2b49577d4 SHA-1: e52232c173d13d6f83895370273bb736152d7635 SHA-256: f8e0f8e74d079aee046643c181e8630b5d236cfd6452ac51760eba012e349fc0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://dafemum.ru/wix?keyword=grass+carl+sandburg+theme'. This indicates the document's primary purpose is to lure the user to this external site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of a malicious URL in a PDF strongly suggests a phishing or malware delivery attempt.

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
  • 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://dafemum.ru/wix?keyword=grass+carl+sandburg+theme In PDF document text
    • https://cdn.sqhk.co/toxinize/Zgeiast/papa_pear_saga_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465250/normal_5ffd052582e01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_601b93a2b32eb.pdfIn PDF document text
    • https://weduxuvup.weebly.com/uploads/1/3/4/3/134308116/repowerenutadel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422161/normal_6006388334248.pdfIn PDF document text
    • https://zonanasuwovu.weebly.com/uploads/1/3/2/6/132683154/6756655.pdfIn PDF document text
    • http://liberum.sportsontheweb.net/bewujajima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_5fe6734bbd0c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_6034faa0e1c8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_6042df1085263.pdfIn PDF document text
    • https://cdn.sqhk.co/xusopusavo/PYrgjMQ/dunebotekuwuvibuses.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/ghihfkG/wipet.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/jobavo/xufaka.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/99706455646.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/cas_disclosure_statement_template.pdfIn PDF document text
    • http://lojibovel.myartsonline.com/230408405.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/1019963415.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_off0000e47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 5524 bytes
SHA-256: a4cc09c02c775fdac012ea87003e968a220bf65712186899de204a5066c57852
font_01_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 10644 bytes
SHA-256: 7e78a6fe37ee91f09dfc9590845bbc58fec7fafc1220806214cb8448c0ec132e

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