Malicious PDF — malware analysis report

Static analysis result for SHA-256 3437a7b57e843757…

MALICIOUS

PDF

75.6 KB Created: 2021-02-08 07:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9d0324ccdc0eaa7d2bb0fb84044df7c5 SHA-1: 71be63fcac6570c41183cbc37b7a7f5d3813aa5b SHA-256: 3437a7b57e843757ab35aaaea64fd2acd9069eb7e705406839e6b4356646c996
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/wb?keyword=air%20and%20noise%20pollution%20control%20book%20pdf In PDF document text
    • http://edarudost.online/27119397903hz8ih.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427295/normal_601b3984050c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502439/normal_601703c4e75d9.pdfIn PDF document text
    • http://aycotoro5.xyz/58972358337brh4v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_5fe87aaddcebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500667/normal_601b27a8aee92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476758/normal_5ffb1b0ef14e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_5fe6cd2158e52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425256/normal_5fcb3256d479d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5fcd38b96a0a0.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/florian_poddelka_nakedeitba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450259/normal_5fcda2abc9450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_5fd666296fd1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367944/normal_5feafa9ee21cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426822/normal_5fef642b09161.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://riluromeni.epizy.com/49105432487.pdfIn PDF document text
    • http://musovulazapa.epizy.com/arduino_m0_mini_datasheet.pdfIn PDF document text
    • http://satuvet.epizy.com/esc_ventricular_arrhythmia_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/99496237396.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/free_printable_punctuation_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/mutanabbi_ki_sharah.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_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 5344 bytes
SHA-256: 60b5209225c03d916a2b26bd85791bee3839e5d0d09027648c81579ccd9b3f7e
font_01_sfnt_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 10876 bytes
SHA-256: 988dab6795a7ac43edfdc702dbc467ab9f805d28b4a36eea09e1353561df7470

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