Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c184275535372f…

MALICIOUS

PDF

77.9 KB Created: 2021-03-15 19:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c30b73b98888dcc8f1a75c342209aae8 SHA-1: 2777f9860ba1b4c85118f30565f1dc3c3d438306 SHA-256: e4c184275535372f0f92636b2b9adb60e1418a58a8d2c8f310b8905df31b32ec
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged by heuristics as a link farm and by ClamAV as a phishing trojan. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Bodo romantic video song'. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/123?utm_term=bodo+romantic+video+song PDF link annotation
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/rudagorugiken_kuxik.pdfIn PDF document text
    • http://futevosug.22web.org/modern_arabic_poetry_an_anthology.pdfIn PDF document text
    • https://mikuloxituxawe.weebly.com/uploads/1/3/1/4/131410747/rimiwi.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/norog.pdfIn PDF document text
    • http://dixurujisefumet.22web.org/sensory_play_research.pdfIn PDF document text
    • http://filuniguwol.22web.org/kakajevotevapa.pdfIn PDF document text
    • http://nagesebaz.iblogger.org/meningitis_cdc_guidelines.pdfIn PDF document text
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/7635a4666a9.pdfIn PDF document text
    • https://jotogenawe.weebly.com/uploads/1/3/1/4/131406354/6b9249a3b40f48.pdfIn PDF document text
    • https://baluwona.weebly.com/uploads/1/3/4/6/134611665/9922240.pdfIn PDF document text
    • https://rutenavujom.weebly.com/uploads/1/3/0/8/130814208/lajotarizuxed.pdfIn PDF document text
    • https://dizilezojo.weebly.com/uploads/1/3/4/2/134234798/699a5100514.pdfIn PDF document text
    • https://fuwurobo.weebly.com/uploads/1/3/0/8/130814642/kafikosubawikekode.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cff07a16-13b2-455b-8a78-148a75b158b4.filesusr.com/ugd/cda0c7_5f303cb60c3044259dee1638e7ae1681.pdf?index=trueIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_99b07d058e1749e4921dc9f0d3fa1b93.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pujirageg/50722093373.pdfIn PDF document text
    • http://fixowix.epizy.com/tazuvoxujuwevoroxol.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_5fe869a1501e4719926b79bf8587f787.pdf?index=trueIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_18d6aa09950a45feaf1a9a01991a9f2e.pdf?index=trueIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_8a280255a4ce496f8d776ad1240800ce.pdf?index=trueIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_9135b71fa85643949ddc5100c6b53658.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/gudivada_weather_report.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_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 5336 bytes
SHA-256: f71adedd7512b2b5cbadb0a76fdc14494418ddfebc85144ab13f935cd1afc91d
font_01_sfnt_off0001058c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058C 10712 bytes
SHA-256: 574585fc5b1d1e3c5b6641b57e857c8b52f0ceb82c1577d53ce104b9cd21aa4d

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