Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ca42bacfe452c9…

MALICIOUS

PDF

77.3 KB Created: 2021-03-09 20:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f5af01cba286c611266d30c2f58df0dc SHA-1: ee91d9e2ec163c379af2444e60ce29c47adf9314 SHA-256: c5ca42bacfe452c9bc52cf18c3c7a433d56b042939a143896f696bc2a6e369bf
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the detection suggest the PDF is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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
  • 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://jumiwimov.ru/award?keyword=historias+da+carochinha+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419415/normal_5fc84bd118e6c.pdfIn PDF document text
    • http://warupipujamoru.sportsontheweb.net/1260048382.pdfIn PDF document text
    • http://lovemecompletely.com/option_button_in_html_formwv39y.pdfIn PDF document text
    • http://pufegusikozig.22web.org/bamojijuvuporaxupud.pdfIn PDF document text
    • https://majizozu.weebly.com/uploads/1/3/4/5/134598595/092c49.pdfIn PDF document text
    • http://snapchat-alert.com/vusulod1ml49.pdfIn PDF document text
    • http://juxowupekabaf.mygamesonline.org/solid_slab_bridge_design_example.pdfIn PDF document text
    • http://cmb-accueil.com/52513081270fvant.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/08_dodge_avenger_alternator_replacement.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/bncc_2020_educao_fsica.pdfIn PDF document text
    • https://gotukedefiwukub.weebly.com/uploads/1/3/5/3/135309477/2a3f2fc.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/abdcf.pdfIn PDF document text
    • http://akb54.ru/biodata_for_marriage_doc_formathobl7.pdfIn PDF document text
    • https://firedilem.weebly.com/uploads/1/3/1/4/131407958/9d0478d9ae5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_60392c0251c4d.pdfIn PDF document text
    • http://thecabinets.xyz/832337816566lcp9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5fdc0156e888b.pdfIn PDF document text
    • https://jubigugatuse.weebly.com/uploads/1/3/0/7/130775741/womezopudulesu.pdfIn PDF document text
    • http://zewarog.22web.org/dr_arthur_aron_36_questions_to_fall_in_love.pdfIn PDF document text
    • http://xagugudel.sportsontheweb.net/xugewigemefanowidok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dunetelezosamat.epizy.com/apc_backup_ups_es_350_replacement_battery.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_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 5172 bytes
SHA-256: 04ab58f80a023eaefd6b423e060aa1f73607a429f43621a0eb98bf1f3b206de4
font_01_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 11352 bytes
SHA-256: 82ec1aa50bd4ced11b327ede6d6f07d7781fd1bef70af231d6aa640d4b400f50

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