Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd508b5dc7639d02…

MALICIOUS

PDF

75.0 KB Created: 2021-03-13 21:35:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e519ced06ce6d7da30ae4d0b71e46d96 SHA-1: 96e55d4a6bcebd915a66eae18792d0432cdd5903 SHA-256: fd508b5dc7639d02d730409717b9045c452f7803c6abbdeb04793d33e849d8fa
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting or suspicious domains, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to PDF generation and keywords that could be used in a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://vilenefex.ru/award?keyword=algebra+1+chapter+test+pdf PDF link annotation
    • http://sukuwodexi.scienceontheweb.net/73954781379.pdfIn PDF document text
    • http://leadtop.co/70629096795xvlkt.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/vogemadivetaferiz.pdfIn PDF document text
    • http://nurigoluda.mygamesonline.org/25690466951.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/sansa_e280_manualih39j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388065/normal_5fc92e7088524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415045/normal_6044de57ee6a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420025/normal_5fcc40645ded8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473030/normal_5fea34574b392.pdfIn PDF document text
    • http://all-system7.work/64928267900zuuk8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448137/normal_602a34543911a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454420/normal_600556a02112c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448115/normal_5feaff3214920.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/are_harvester_ant_bites_dangerous.pdfIn PDF document text
    • http://all-host.site/raputatasegijof6gl0k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lodumojokexiku.onlinewebshop.net/data_acquisition_system_notes.pdfIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_d7df8755fd6a4a5f80ddde9522202de7.pdf?index=trueIn PDF document text
    • http://bitines.myartsonline.com/xupomapewalepukirifeboji.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_98eb95262a34446381b49330788c5736.pdf?index=trueIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_ea152d2968c5436ba478ddb1dbe9ab8d.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_441adb1381e1485fa8452e90db8f9627.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_9c0bae6ae568424f99bf6a88029cce08.pdf?index=trueIn PDF document text
    • http://pabotojixupi.atwebpages.com/behavioral_theory_of_smoking.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_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 5600 bytes
SHA-256: e6c28da3e643f9ced271c91103533b77aec60a5bde817ec77dc5d077f2c9c9dc
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 10432 bytes
SHA-256: 82e921e1bc32617579b832271510de544e15169b32d0a82e86302c645d2c3d32

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