Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2857541ce5f7d19…

MALICIOUS

PDF

74.2 KB Created: 2021-03-19 17:52:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5b9c89c8320238c61f9786083289cf6f SHA-1: 5938280b57d9bad197cfe7f8bbe09280f0151e06 SHA-256: b2857541ce5f7d1906d308417b95cc54ff5920db7dc50d3b66a334cc20e8c009
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URIs pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://dugedepap.ru/wix?keyword=info+direct+trinity+christian+academy PDF link annotation
    • http://nexatup.iblogger.org/nopoge.pdfIn PDF document text
    • http://bagagapesum.22web.org/34592826711.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/proyecto_arquitectonico_de_una_casa.pdfIn PDF document text
    • http://terugate.mypressonline.com/machine_learning_for_finance_in_python_datacamp_github.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/zititeja-tutegetatusu-bekurolezusep-gekutuwisunakak.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/craig_jukebox_bluetooth_speaker_system_instructions.pdfIn PDF document text
    • http://zutumufedige.getenjoyment.net/76915119468.pdfIn PDF document text
    • https://kimilofu.weebly.com/uploads/1/3/0/8/130873947/tivebiwu_xotutifapek_wijalaronid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwowemopuri.epizy.com/48458106033.pdfIn PDF document text
    • http://najekaweza.onlinewebshop.net/split_merge_download_free.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/22062335531.pdfIn PDF document text
    • http://logedulon.epizy.com/silopaj.pdfIn PDF document text
    • http://mivurukelino.onlinewebshop.net/plural_nouns_ending_in_f_or_fe_worksheet.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_009d51d0167e43ee899da259161bd4d6.pdf?index=trueIn PDF document text
    • https://1e2e1d2f-e5bc-406e-8ade-c93a3c5db6fe.filesusr.com/ugd/81c7be_e0ee7502f65f4b56a901cf577d07ccf8.pdf?index=trueIn PDF document text
    • http://daforewepon.epizy.com/54419896101.pdfIn PDF document text
    • http://zusapogadakafa.rf.gd/copd_exacerbation_guidelines_australia.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_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 5268 bytes
SHA-256: eb095ec46d0f9d81003e9ed0c772ddb0e657bd05284d55bdfbebb234482308e6
font_01_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 11412 bytes
SHA-256: 534c44ee8b4a4a841369339ba21355fde50c3524d167401cc4b9543b0b3a7ed1

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