Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1dddc7ad276e884…

MALICIOUS

PDF

70.5 KB Created: 2021-03-05 21:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 56d52cefa0ae8d87dc877657fba95a9d SHA-1: 1337d4fd018a86cd9bbbec20ccc9805d22b13ade SHA-256: e1dddc7ad276e88448b37c5d85277e33078e0ee98a4297f16c70ab0eb83183f6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://druttle.ru/wix?keyword=noun+clause+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481418/normal_60173613a7e8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465024/normal_6037480238949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392441/normal_6023c5f9a4392.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/giAMFha/bipamixigexiketis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446944/normal_5fdb523225c78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_6022c9a19786d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413843/normal_600a06f359599.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvuvidova/eIcjb2T/zadugusatixajonidakezuvab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372371/normal_5fe62179559c7.pdfIn PDF document text
    • http://padojuputiki.iblogger.org/22735876591.pdfIn PDF document text
    • http://betifogolejom.iblogger.org/alexander_the_great_nicknames.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/qiehcGz/3742076426.pdfIn PDF document text
    • http://populiro.iblogger.org/allelic_variation_and_gene_function.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457000/normal_6013aa4f95925.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/jhBajiM/ripabafewikanupuselibogas.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/gQpHija/32367604353.pdfIn PDF document text
    • http://zadorakevoseji.iblogger.org/can_you_put_directv_app_on_roku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pexomesukifek.epizy.com/gegijokadejit.pdfIn PDF document text
    • http://mutaloliz.epizy.com/97520431779.pdfIn PDF document text
    • http://malebujezasipip.rf.gd/android_developer_jobs_in_mnc_companies_pune.pdfIn PDF document text
    • http://salilizuvozel.rf.gd/one_gippsland_tv_guide.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_off0000d80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80F 5012 bytes
SHA-256: 76e2ee26c0c45a7706e08ac23934a6a4a330a7acd1200409e4109b46ae4947cd
font_01_sfnt_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 10608 bytes
SHA-256: 2baa3bc1e3462b3e812ff9e7050a48ba05ecd81bfd9d9ebe3f1c2257e9129d83

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