Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d0c77813f91d49…

MALICIOUS

PDF

77.3 KB Created: 2021-02-14 06:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: f87b1f142084146d0514f384d52b677a SHA-1: e138587a52d87cb1df8c798f27546199de9e1b1e SHA-256: 12d0c77813f91d4935c4800b095731acf8037c74cfe4783b7e2fe22261a3f8d1
184 Risk Score

Malware Insights

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

The PDF contains embedded links and is flagged by multiple heuristics as malicious, including a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to educational content to entice users to click the malicious URL.

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/wix?keyword=ordering+fractions+from+least+to+greatest+worksheet+answer+key In PDF document text
    • https://static.s123-cdn-static.com/uploads/4409799/normal_5ff0aa6c71d8d.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/heQigS8/piano_online_lessons_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481994/normal_5ffcbbe265f29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_6011190629604.pdfIn PDF document text
    • http://redtea.space/41382138679yfvqe.pdfIn PDF document text
    • http://mjawebdesign.net/beyonce_platinum_edition_download_zipoesuq.pdfIn PDF document text
    • http://presentinsta.online/konowok869hk.pdfIn PDF document text
    • http://imm-shoes2.club/dimplex_quantum_installation_guide3e682.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dimuwebogikufuf.rf.gd/75625681923.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/bitifovogupedus.pdfIn PDF document text
    • http://lobosenus.epizy.com/globe_and_mail_holiday_crossword_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/english_reading_stories_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/joining_letter_mail_format.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_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 5720 bytes
SHA-256: 6dea2965d578e62259f552fd663c4b18ab00d1888f8d8c71841f5274f41c720c
font_01_sfnt_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 10460 bytes
SHA-256: 8be402323f10e1b44c33639447e4449be691f474a40dc0743251512983ea3483

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